Bracketed information omitted and filed separately with the Securities and 
                              Exchange Commission
Confidential Treatment Requested Under 17 C.F.R. Sections 200.80 (b)(4), 200.83
                                 and 240.24b-2

                                                                    EXHIBIT 10.5

                               CORNING BIO INC.

                       MANUFACTURING SERVICES AGREEMENT

          This manufacturing services agreement dated this 17th of September,
1996 (the "Agreement") between Sensus Corporation, a Delaware corporation
("Sponsor") having its principal place of business at 98 San Jacinto Boulevard.
Suite 430, Austin, TX 78701 and Corning Bio Inc., a Delaware Corporation
("CBI"), having its principal place of business at 6051 George Watts Hill,
Research Triangle Park, NC, 27709.

WITNESSETH
WHEREAS, CBI provides a full range of bioprocessing services to the
biopharmaceutical industry, including process development, fermentation, cell
culture, separation/purification, bioanalytical chemistry, quality control,
quality assurance, fill/finish, and regulatory affairs.

WHEREAS, sponsor desires CBI to perform services in accordance with the terms of
this Agreement and the Scope of work (as hereinafter defined) related to the
development of a process for production and the production of the material known
as Somavert/TM/ (the "Product" and also referred to as rh Growth Hormone
Antagonist) and CBI desires to perform such services.

NOW, THEREFORE, in consideration of the above statements and other good and
valuable consideration, the sufficiency and receipt of which are hereby
acknowledged, the parties hereto agree as follows:

Section 1.
SCOPE OF WORK
a)  Upon CBI's written acceptance of a detailed scope of work document ("Scope")
    to be provided by Sponsor or prepared by CBI under Sponsor's direction and
    approved by Sponsor, CBI will perform the service or services ("Program")
    for Sponsor in accordance with the Scope. The Scope will specify the program
    design, information desired, estimated duration of the Program, and all
    other matters pertinent to completion of the Program, and will be deemed a
    part of this Agreement and is attached hereto as Attachment A and is
    incorporated herein by reference.

b)  CBI will, at Sponsor's request, consult with Sponsor in developing the
    Program design in a manner consistent with current regulatory guidelines.
    However, CBI does not warrant that the Program and/or the Program results
    will satisfy the requirements of any regulatory agencies at the time of
    submission of Program results to such agencies.

                                       1.

 
Section 2.
PROGRAM PERFORMANCE
CBI shall use its best efforts to provide facilities, supplies, and staff
necessary to complete the Program as provided in the Scope, as it may be
modified as provided herein, and in accordance with the terms of this Agreement.
In the event of any conflict, the terms of this Agreement shall control.

Section 3
PROGRAM MATERIALS
a)  Sponsor will provide CBI with sufficient amounts of all raw materials, or
    other substances with which to perform the Program (the "Materials"), as
    well as all documentation and such other data as may be necessary, to
    apprise CBI of the stability of the Materials, process characteristics,
    proper storage, manufacturing and safety requirements. Sponsor will also
    provide CBI with all necessary information to effect the reliable transfer
    of the process from the Sponsor to CBI.

b)  Upon completion of the Program, any remaining samples of the Materials or
    other substances provided to CBI will be returned to Sponsor or retained by
    CBI in compliance with regulatory requirements. CBI will appoint a CBI
    representative (the "Program Director") to be responsible for the completion
    of the Program by CBI. The Program Director will coordinate performance of
    the Program with a representative designated by Sponsor (the "Sponsor
    Representative"), which representative shall have responsibility over all
    matters relating to performance of the Program on behalf of Sponsor. Unless
    otherwise agreed in the Scope, all communications between CBI and the
    Sponsor regarding the conduct of the Program pursuant to the Scope shall be
    addressed to or routed through the Program Director and Sponsor
    Representative, directly. CBI may, under notification and approval by the
    Sponsor, substitute the Program Director during the course of the program.

Section 4.
COMPLIANCE WITH GOVERNMENT REGULATIONS
a)  CBI will perform the Program in accordance with the Scope and in accordance
    with the current state of the Food and Drug Administration's Good
    Manufacturing Practices. Subject to paragraph b. of Section 4 below, CBI
    will also comply in all material respects with all applicable government
    regulatory requirements concerning current Good Manufacturing Practices
    appropriate to the Program.

b)  Should such government regulatory requirements be changed, CBI will make
    every reasonable effort to satisfy the new requirements. In the event that

                                       2.

 
    compliance with such new regulatory requirements necessitates a change in
    the Scope for the Program, CBI will submit to Sponsor a revised technical
    and cost proposal for Sponsor's acceptance prior to making any changes in
    the Scope or the Program.

c)  In the event of a conflict in government regulations, Sponsor will
    designate, in writing, which regulations shall be followed by CBI in its
    performance of the Program.

Section 5.
FACILITY VISITS
a)  Sponsor's representatives may visit CBI's facility at reasonable times and
    with reasonable frequency during normal operation of the Program to observe
    the progress of the Program. CBI will assist Sponsor in scheduling such
    visits which will be in compliance with CBI's internal policies and standard
    operating procedures covering such activities.

Section 6.
COMPENSATION
Estimates for manpower, facility utilization and level of effort for the Program
are outlined in the Scope. Sponsor shall pay CBI the initial payment and will be
invoiced monthly for work performed under the Scope in accordance with the
Payment Schedule attached hereto as Attachment B and in accordance with the
hourly personnel and weekly facility billing rates listed below:

                            Personnel Hourly Rates
                            ----------------------



                                     1996   1997
                                     -----  -----
                                      
    Vice President                   $ [*]  $ [*]
    Process Development Scientist      [*]    [*]
    Manager/Engineer                   [*]    [*]
    Supervisor                         [*]    [*]
    QA Professional                    [*]    [*]
    Operator                           [*]    [*]
    QA Technician                      [*]    [*]
    Clerical                           [*]    [*]


                             Facility Weekly Rates
                             ---------------------


                                      1996   1997
                                      -----  -----
                                        
Process Development Area*             $[*]   $[*]
Fermentation Area, Main Plant         $[*]   $[*]
 

*Assumes using approx. one-fourth of the total process development facility.

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                       3.

 
b)  Payment for laboratory consumables and other materials used in and for the
    Program will be in accordance with the terms and conditions of this
    paragraph (b). General laboratory consumables will be billed as used and an
    estimate of consumable costs for the program is attached hereto as
    Attachment C.

    Both parties recognize that CBI will be starting-up a new laboratory to
    perform the Program. The consumable fee is meant to cover items actually
    used in the performance of the Program. The Sponsor will not be responsible
    for stocking general lab supplies as part of the laboratory start-up.

    The consumables billing and usage will be reviewed quarterly with the
    Sponsor.

    'Capital' purchases greater than $[*] that are required for performing the
    Program will be approved by the Sponsor prior to purchase. Such purchases
    will be invoiced to the Sponsor as part of the normal monthly invoice and
    contain a [*] handling fee.

c)  Payment is due 30 days after Sponsor's receipt of the invoice. Late payments
    are subject to an interest charge of one and one-half percent (1 1/2%) per
    month. Any payments that are greater than 90 days past due constitute a
    breach of this Agreement. See Section 13 for procedure for resolution of
    payment dispute.

Section 7.
CONFIDENTIAL INFORMATION/LEGAL PROCEEDINGS
a)  CBI will not disclose, without Sponsor's written permission, any information
    pertaining to Sponsor's Program unless such disclosure: 1) is to an
    affiliate of CBI who is under a similar obligation to keep such information
    confidential; 2) is or becomes publicly available through no fault of CBI;
    3) is disclosed by a third party entitled to disclose it; 4) is already
    known to CBI as shown by its prior written records; or 5) is required by any
    law, rule, regulation, order decision, decree, subpoena or other legal
    process to be disclosed. If such disclosure is requested by legal process,
    CBI will make all reasonable efforts to notify Sponsor of this request
    promptly prior to any disclosure to permit Sponsor to oppose such disclosure
    by appropriate legal action.

b)  If CBI shall be obliged to provide testimony or records regarding any
    Sponsor Program in any legal or administrative proceeding, then Sponsor
    shall reimburse CBI its out-of-pocket costs therefore plus an hourly fee for
    its employees or representatives equal to the internal fully burdened costs
    to CBI of such employee or representative.

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                       4.

 
Section 8
WORK PRODUCT
a)  All work outputs (e.g. reports) will be prepared on CBI's standard format
    unless otherwise specified in the Scope.

b)  Sponsor will have title to all raw data, documentation, records, protocols,
    specimens and other reports generated as a result of the Program. All such
    written materials will be archived by CBI for a period of five (5) years
    following completion of the Program unless otherwise defined by the Program
    or required by applicable laws or regulations. Five (5) years after
    completion of the Program, all of the aforementioned written materials will
    be sent to the Sponsor and a return fee will be charged. The Sponsor may
    elect to have the materials retained in the CBI Archives for an additional
    period of time at additional costs. If the Sponsor chooses to have CBI
    dispose of the materials, a disposal fee will be charged. CBI will continue
    to retain such documentation and materials as required by regulations and as
    may be required by law, pertaining to such activities as well as for
    archival purposes.

Section 9
INVENTIONS AND PATENTS
At Sponsor's request, CBI will assign to Sponsor any patentable product
improvement invention discovered by CBI employees exclusively as a result of
performing the Program under this Agreement; provided Sponsor requests such
                                             --------                      
assignment, in writing, within one year of notification of such invention;
provided further that CBI shall retain all fights to any inventions relating to
- ----------------
manufacturing methods and processes discovered in connection with the Program
(Process Inventions). For Process Inventions, CBI will grant to Sponsor a
royalty-free license under terms mutually agreeable to the parties for the field
of use required for Sponsor to commercialize the Product developed or produced
under this Agreement, and for so long as CBI is producing [*] of the Sponsor's
annual requirement for Product, CBI shall not license the Process Invention to
any entity other than Sponsor. If Sponsor requests and at Sponsor's expense, CBI
will execute any and all applications, assignments or other instruments and give
testimony which shall be necessary to apply for and obtain Letters of Patent of
the US or of any foreign country and Sponsor shall compensate CBI for the time
devoted to such activities and reimburse it for expenses incurred.

Section 10.
INDEPENDENT CONTRACTOR
CBI shall perform the Program as an independent contractor of Sponsor and shall
have complete and exclusive control over its facilities, equipment, employees
and agents. Nothing in this agreement or other arrangements for which it is made
shall constitute CBI, or anyone furnished or used by CBI in the performance of
the services, as employee, joint venture, partner, or servant of Sponsor.

Section 11.
INSURANCE

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                       5.

 
CBI shall secure and maintain in full force and effect throughout the
performance of the Program policies of insurance for (a) Workmen's Compensation,
(b) General Liability, (c) Automobile Liability, and (d) Product Liability
having policy limits, deductibles and other terms appropriate to the conduct of
CBI's business in CBI's sole and exclusive judgment. Certificates evidencing
such insurance will be made available for examination upon request of the
Sponsor.

Section 12
DEFAULT
If CBI is in default of its material obligations under this Agreement, then
Sponsor shall promptly notify CBI in writing of any such default. CBI shall have
a period of 45 days from the date of receipt of such notice within which to cure
such default; provided that if such default renders the Program invalid, then
              ---------                                                      
CBI, shall, at its option, either ( 1 ) repeat the Program at its cost within a
time period mutually agreed to by it and Sponsor or (2) refund the contract
price paid by Sponsor. If CBI shall fail to cure such default within the
specified cure period or repeat the Program, as the case may be, then this
Agreement shall, at Sponsor's option, immediately terminate. In the event of
such termination, Sponsor's sole remedy shall be, in the case where such default
has not rendered the Program invalid, a reduction in the total contract price
for the Program in an amount equal to the difference between (1) the total
contract price for the Program and (2) the value of the work properly performed,
and, in the case where such default does render the Program invalid, a refund of
the contract price; provided however that under no circumstances shall CBI be
liable to Sponsor in an amount that, in aggregate exceeds, the contract price
paid for such Program.  UNDER NO CIRCUMSTANCES SHALL SPONSOR BE ENTITLED TO
INCIDENTAL, INDIRECT, CONSEQUENTIAL OR SPECIAL DAMAGES ARISING IN CONNECTION
WITH SUCH DEFAULT OR BREACH OF CBI'S OBLIGATIONS UNDER THIS AGREEMENT, THE SCOPE
OR ANY DOCUMENTS OR ATTACHMENTS RELATED THERETO.

Section 13.
DISPUTE RESOLUTION
In the event any dispute shall arise between the Sponsor and CBI with respect to
any of the terms and conditions of this Agreement or the Protocol; then senior
executives of the Sponsor and CBI shall meet as promptly as practicable after
notice of such dispute to resolve in good faith such dispute. In the event the
parties are unable, despite their good faith efforts, to resolve such dispute
within 30 days after notice of such dispute to their mutual satisfaction, then
such dispute shall be promptly after such 30 day period submitted to non-binding
mediation. The timing, venue, and method of the non-binding mediation, and the
type and identity of the mediator shall be acceptable to both the Sponsor and
CBI.  The

                                       6.

 
Sponsor and CBI shall share equally the costs of the mediation.  If the Sponsor
and CBI are unable, despite their good faith efforts, to agree on a mediator and
the aspects of the non-binding mediation process specified above within 45 days
after the senior executives, as applicable, have unsuccessfully terminated their
discussions or if either party disagrees with the mediator's decision, in the
case where the dispute is submitted to non-binding mediation, then the Sponsor
and CBI shall be entitled to exercise and enforce all of their rights and
remedies, both in law and in equity, with respect to such dispute.

Section 14.
INDEMNIFICATION
a)  CBI shall hold harmless, defend and indemnify Sponsor and its parent
    company, affiliates, subsidiaries, and their respective directors, officers,
    employees, and agents from and against any and all third party claims,
    proceedings, damages and losses, including reasonable attorney fees and
    court costs, (collectively, "Claims") arising out of: (a) the negligence or
    intentional misconduct of CBI, or, (b) any breach of this Agreement by CBI.

b)  Sponsor shall hold harmless, defend and indemnify CBI and its parent
    company, affiliates, subsidiaries, and their respective directors, officers,
    employees, and agents from and against any and all Claims arising out of:
    (a) the negligence or intentional misconduct of Sponsor, (b) any breach of
    this Agreement by Sponsor, or (c) CBI's involvement with the Program, or the
    harmful or otherwise unsafe effects of the Product, the intermediates in the
    process, or the Materials supplied by Sponsor that are not commercially
    available.

Section 15
REPRESENTATION
Sponsor hereby represents to CBI that to the best of its knowledge Sponsor has
valid licenses to the raw material, expression systems, process patents and the
Product and that CBI's performance of the Program will not violate or infringe
on the patents, trademarks, tradenames, servicemarks or copyrights of any other
party.

Section 16
FORCE MAJEURE
Either party shall be excused from performing its obligations under this
Agreement if its performance is delayed or prevented by any event beyond such
party's reasonable control, including, but not limited to, acts of God, fire,
explosion, weather, disease, war, insurrection, civil strife, riots, government
action, or power failure, provided that such performance shall be excused only
to the extent of and during such disability. Any time specified for completion
of performance in the Scope falling due during or subsequent to the occurrence
of

                                       7.

 
any or such events shall be automatically extended for a period of time to
recover from such disability. CBI will promptly notify Sponsor if, by reason of
any of the events referred to herein, CBI is unable to meet any such time for
performance specified in the Scope. If any part of the Program is invalid as a
result of such disability, CBI will, upon written request from Sponsor, but at
Sponsor's sole cost and expense, repeat that part of the Program affected by the
disability.

Section 17.
ALLOCATION OF RESOURCES
If delays in the agreed commencement or performance of the Program occur because
of the Sponsor's inability to supply CBI with the Materials or any information
required to begin or perform the Program within 30 days of such agreed time, CBI
may reallocate resources being held for performance of the Program without
incurring liability to Sponsor.

Section 18.
USE OF NAMES
Neither party shall use the name of the other party or the names of the
employees of the other party in any advertising or sales promotional material or
in any publication without prior written permission of such party.

Section 19.
TERMINATION BY SPONSOR
a)  Sponsor may at any time terminate the Program prior to completion by giving
    written notice to CBI. In such event CBI shall immediately comply with such
    notice to terminate work on the Program and use its best efforts to reduce
    cost to Sponsor, and Sponsor shall pay CBI upon receipt of CBI's invoice all
    of its costs incurred or irrevocably obligated, plus, as liquidated damages
    and not as a penalty, a pro rata portion of applicable profit for the
    Program as of the date of termination. The amount of such profit and the
    basis for the computation thereof shall be specified in a certificate signed
    by the Chief Financial Officer of CBI.

b)  The termination of this Agreement for any reason shall not relieve either
    party of its obligation to the other for obligations in respect of (i)
    confidentiality of information, (ii) consents for advertising purposes and
    publications, (iii) indemnification and, (iv) compensation for services
    performed.

Section 20.
ASSIGNMENT
a)  This Agreement shall not be assigned in whole or in part by either party
    without the prior written consent of the other, which consent shall not be
    unreasonably withheld or delayed. Any attempt to assign this Agreement
    without such consent shall be void and of no effect.

b)  Notwithstanding anything in paragraph a. of this Section 20 to the contrary,
    with the approval of the Sponsor, certain tasks specified in the Scope may
    be subcontracted by CBI.

                                       8.

 
Section 21.
NOTICE
All notices to be given as required in the Agreement shall be in writing and
shall be delivered personally, sent by telecopies, or mailed either by a
reputable overnight carrier or first class mail, postage prepaid to the parties
at the addresses set forth above or such other addresses as the parties may
designate in writing. Such notice shall be effective on the date sent, if
delivered personally or sent by telecopier, the date after delivery if sent by
overnight carrier and on the date received if mailed first class.

Section 22.
CHOICE OF LAW
This Agreement shall be construed and enforced in accordance with the laws of
the State of North Carolina.

Section 23.
WAIVER/SEVERABILITY
No waiver of any provision of this Agreement, whether by conduct or otherwise,
in any one or more instances shall be deemed to be or be construed as a further
or continuing waiver of any such provision, or of any other provision or
condition of this Agreement. If any provisions hereof shall be determined to be
invalid or unenforceable, the validity and effect of the other provisions of
this Agreement shall not be effected thereby.

Section 24.
ENTIRE AGREEMENT; MODIFICATION/COUNTERPARTS
This instrument and the Scope set forth the entire Agreement between the parties
hereto with respect to the performance of the Program by CBI for Sponsor and as
such, supersedes all prior and contemporaneous negotiations, agreements,
representations, understandings, and commitments with respect thereto and shall
take precedence over all terms, conditions and provisions on any purchase order
form or form of order acknowledgment or other document purporting to address the
same subject matter. This Agreement shall not be waived, released, discharged,
changed or modified in any manner except by an instrument signed by the duly
authorized officers of each of the partied hereto, which instrument shall make
specific reference to this Agreement and shall express the plan or intention to
modify same. This Agreement may be executed in one or more counterparts each of
which shall be deemed an original but all of which together shall constitute one
and the same instrument.

                                       9.

 
This Agreement becomes effective and binding on both parties on and as of the
last date that the parties hereto have executed this Agreement. Should terms
contained herein be at variance with the terms and conditions specified in
Sponsor's written acceptance, then the terms and conditions contained herein
take precedence.

Sensus Corporation

         /s/ William F. Bennett               /s/ Chris Kuebler
By:  _____________________________   By:  _____________________________

           William F. Bennett                  Chris Kuebler
Name: ____________________________   Name: ____________________________

          Sr. VP Manufacturing                   Chairman
Title:   _________________________   Title:   _________________________

            20 Sept. 96                          9-19-86
Date:   __________________________   Date:   _________________________


                                      10.

 
                                 ATTACHMENT A

                  TO MANUFACTURING SERVICES AGREEMENT BETWEEN
                CORNING BIO AND SENSUS DATED 17 SEPTEMBER 1996*

[*]

*Terms not defined herein shall have the meaning set forth in the Manufacturing
Services Agreement.

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      1.





 
[*]

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      2.

 
[*]

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      3.

 
5)  ENGINEERING
    -----------

The goal of engineering is to transfer laboratory scale processes to
manufacturing in an economical and properly scaled fashion.

[*]

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      4.

 
B.   BENCHMARKS

[*]

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      5.

 
D.)  INFORMATION TRANSFER:
     ---------------------

It is Corning Bio's intent to update and transfer pertinent data to Sensus at
regular intervals. The intervals are to be determined by mutual agreement and
will be implemented at the commencement of the Program. Written reports will be
prepared in Corning Bio's standard format. Updates and data transfer can be
accomplished by one or more of the following methods:

      Weekly phone calls
      Monthly Reports
      Quarterly reports
      Data Transfer Meetings

E.)   COMMENCEMENT OF THE PROJECT:
      ----------------------------

Development efforts will begin upon a mutually agreeable date. Tentatively, that
date is November 1, 1996.

                                      16.

 
                                  ATTACHMENT B

                  TO MANUFACTURING SERVICES AGREEMENT BETWEEN
                CORNING BIO AND SENSUS DATED 17 SEPTEMBER 1996

                               PAYMENT SCHEDULE
                               ----------------

PAYMENTS AND INVOICES                 ESTIMATED DATE           PAYMENT
- ---------------------                 --------------           -------
[*]

*Monthly invoices will be issued on or about the first of each month and will
cover activities and purchases through the 24th of the preceding month.

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                     

 
                                 ATTACHMENT C
                  TO MANUFACTURING SERVICES AGREEMENT BETWEEN
                CORNING BIO AND SENSUS DATED 17 SEPTEMBER 1996

                  ESTIMATE FOR CONSUMABLES FOR SENSUS PROGRAM
                  -------------------------------------------

                                 Estimated         Estimated
Area                            Total/month    Total for 6 months
- ----                            -----------    ------------------

[*]

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      18.


[*] CERTAIN INFORMATION IN THIS DOCUMENT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
 
                                AMENDMENT NO. 1
                                       TO
                        MANUFACTURING SERVICES AGREEMENT

   Amendment No. 1 dated as of July 3, 1997 (this "Amendment No. 1") between
Covance Biotechnology Services Inc., (f/k/a Corning Bio Inc.), a Delaware
corporation having its principal place of business at 6051 George Watts Hill
Drive, P.O. Box 13865, Research Triangle Park, NC 27709-3865 ("CBSI") and Sensus
Corporation, a Delaware corporation having its principal place of business at 98
San Jacinto Boulevard, Suite 430, Austin, TX 78701 ("Sponsor").

                                  WITNESSETH:

   WHEREAS, CBSI and Sponsor have entered into that certain Manufacturing
Services Agreement dated September 17, 1996 (the "Agreement") wherein CBSI
agreed to perform certain services for Sponsor in connection with the
development of a manufacturing process for a material known as rhGHA, or B2036-
PEG ("Product") in accordance with the Scope; (terms defined in the Agreement
and not otherwise defined herein are used herein as defined therein); and

   WHEREAS, CBSI has progressed the development phase of the production process
for Product as defined in the Scope and Sponsor now wishes to amend the
Agreement whereby CBSI will undertake the production phase of the Program for
Product in accordance with the terms of a new scope of work document (as defined
below) and CBSI desires to amend the Agreement to provide said manufacturing
services to Sponsor.

   NOW, THEREFORE, for good and valuable consideration the sufficiency and
receipt of which are hereby acknowledged, the parties agree to as follows:

   1.  SCOPE OF WORK.  A detailed scope of work document for the production of
Product (the "Revised Scope") prepared by the parties is attached to this
Amendment No.  1.  CBSI will perform the services set forth in the Revised Scope
in accordance with the terms and conditions of the Agreement.  Except as
expressly modified herein, all terms and conditions of the Agreement will remain
in full force and affect.

   2.  AMENDMENT TO SECTION 6 OF THE AGREEMENT.  Section 6 of the Agreement is
hereby amended to append subparagraph d) to Section 6 as follows:

       d) The Revised Scope attached to this Amendment No. 1 outlines the
       activities that will be performed during the manufacturing phase of the
       Sponsor's development program for the Product. The Revised Scope also
       contains the prices and Payment Schedule associated with performing the
       activities outlined in the Revised Scope. CBSI will invoice Sponsor after
       achieving the milestones listed in the Payment Schedule. The amount of
       the invoices will

                                      1.

 
       equal the payment associated with the corresponding milestone. The
       estimated dates in the Payment Schedule are provided for planning
       purposes; invoices will be sent after actually achieving milestones.
       Payment is due 30 days after Sponsor's receipt of the invoice. Late
       payments are subject to an interest charge of one and one-half percent (1
       1/2%) per month. Any payments greater than 90 days past due constitute a
       breach of this Agreement.

   3.  AMENDMENT TO SECTION 14 OF THE AGREEMENT.  Section 14 of the Agreement is
hereby amended in full to read as follows:

   SECTION 14.
   INDEMNIFICATION

       (A) CBSI shall indemnify Sponsor and its affiliates and their respective
       officers, directors, agents, and employees from any loss, cost, damage or
       expense (a "Loss") from any lawsuit, action, claim, demand, assessment or
       proceeding (a "Claim") for personal injury to Program participants or
       personal injury to any employee or agent of Sponsor or property damage
       arising or occurring during the conduct of the Program as a result of
       CBSI's negligence, gross negligence or intentional misconduct or
       inaction; provided that if such Loss or Claim arises in whole or in part
                 --------
       from Sponsor's negligence, gross negligence or intentional misconduct or
       inaction; or CBSI's violation, noncompliance, or nonperformance of any of
       the terms of this Agreement then the amount of the Loss that CBSI shall
       indemnify Sponsor for pursuant to this Section 14 shall be reduced by an
       amount in proportion to the percentage of Sponsor's responsibilities for
       such Loss determined by a court of competent jurisdiction in a final and
       non-appealable decision or in a binding settlement between the parties.

       (B) Sponsor shall indemnify CBSI and its affiliates and their respective
       officers, directors, employees and agents (the "CBSI Group") from any
       Claim or Loss arising from or related to (i) personal injury to a
       participant in the Program or personal injury to any employee of the CBSI
       Group directly caused by the Material, Product, intermediates or the
       Program, (ii) the harmful or otherwise unsafe effect of the Materials or
       Product, including, without limitation, a Claim based upon Sponsor or any
       other person's use, consumption, sale, distribution or marketing of any
       substance, including the Material or the Product, (iii) the negligence,
       gross negligence or intentional misconduct or inaction of Sponsor in the
       performance of its obligations under this Agreement or Scope related to
       the Program, or (iv) the Sponsor's violation, non-compliance or non-
       performance of any of the terms of this Agreement or the Sponsor's breach
       of any representation made herein, or (v) any violation or infringement
       of any third party's intellectual property rights including, without
       limitation, any patent, copyright, trademark, trade secret, license or
       other property

                                      2.

 
          right; provided that if such Loss or Claim (other than a Loss or Claim
                 --------                                                       
          described in clause (ii) hereof) arises in whole or in part from
          CBSI's negligence, gross negligence or intentional misconduct or
          inaction or, with respect to a Loss or Claim described in clause (v)
          hereof, from any violation or infringement of any third party's
          intellectual property rights arising from CBSI's use of any expression
          system or process developed by CBSI under this Agreement to make,
          create, or produce the Product (except to the extent that Sponsor is a
          contributory infringer) or CBSI's violation, noncompliance, or
          nonperformance of any of the terms of this Agreement, then the amount
          of such Loss that Sponsor shall indemnify the CBSI Group for pursuant
          to this Section 14 shall be reduced by an amount in proportion to the
          percentage of CBSI's responsibilities for such Loss as determined by a
          court of competent jurisdiction in a final and non-appealable decision
          or in a binding settlement between the parties.  Sponsor shall not
          indemnify the CBSI Group from any Loss from any claim described in
          clause (ii) hereof arising solely from the gross negligence,
          recklessness, or willful misconduct or inaction of CBSI.

          (C) Upon receipt of notice of any Claim which may give rise to a right
          of indemnity from the other party hereto, the party seeking
          indemnification (the "Indemnified Party") shall give written notice
          thereof to the other party, (the "Indemnifying Party") with a Claim
          for indemnity.  Such Claim for indemnity shall indicate the nature of
          the Claim and the basis therefore.  Promptly after a claim is made for
          which the Indemnified Party seeks indemnity, the Indemnified Party
          shall permit the Indemnifying Party, at its option and expense, to
          assume the complete defense of such Claim, provided that (i) the
                                                     --------             
          Indemnified Party will have the right to participate in the defense of
          any such Claim at its own cost and expense, (ii) the Indemnifying
          Party will conduct the defense of any such Claim with due regard for
          the business interests and potential related liabilities of the
          Indemnified Party and (iii) the Indemnifying Party will, prior to
          making any settlement, consult with the Indemnified Party as to the
          terms of such settlement.  The Indemnified Party shall have the right,
          at its election, to release and hold harmless the Indemnifying Party
          from its obligations hereunder with respect to such Claim and assume
          the complete defense of the same in return for payment by the
          Indemnifying Party to the Indemnified Party of the amount of the
          Indemnifying Party's settlement offer.  The Indemnifying Party will
          not, in defense of any such Claim, except with the consent of the
          Indemnified Party, consent to the entry of any judgment or enter into
          any settlement which does not include, and an unconditional term
          thereof, the giving by the claimant or plaintiff to the Indemnified
          Party of a release from all liability in respect thereof.  After
          notice to the Indemnified Party of the Indemnifying Party's election
          to assume the defense of such Claim, the Indemnifying Party shall be
          liable to the Indemnified Party for such legal or other expenses
          subsequently

                                      3.

 
          incurred by the Indemnified Party in connection with the defense
          thereof at the request of the Indemnifying Party.  As to those Claims
          with respect to which the Indemnifying Party does not elect to assume
          control of the defense, the Indemnified Party will afford the
          Indemnifying Party an opportunity to participate in such defense at
          the Indemnifying Party's own cost and expense, and will not settle or
          otherwise dispose of any of the same without the consent of the
          Indemnifying Party.

      4.  AMENDMENT TO SECTION 15 OF THE AGREEMENT. Section 15 of the Agreement
is hereby amended in full to read as follows:

      SECTION 15.
      REPRESENTATION

      The Sponsor hereby represents and warrants that CBSI's performance of its
      obligations under this Agreement, including, without limitation, the
      making, production or creation of the Product or the use of the Materials
      and the expression systems and processes used to make, create or produce
      the Product, does not violate or infringe on the issued patents,
      trademarks, tradenames, servicemarks or copyrights or other intellectual
      property rights of any other party; provided that the foregoing shall not
                                          --------                             
      apply to the extent that any such expression systems or process used to
      make, create or produce the Product were developed by CBSI.

      5. AMENDMENT. No amendments or modifications to this Amendment No. 1 and
no further amendments or modifications the Agreement may be made without the
written agreement of the parties hereto.

IN WITNESS WHEREOF, the parties hereto have executed or caused this Amendment
No. 1 to be executed by their respective officers or other representatives
hereunder duly authorized as of the date first written above.

COVANCE BIOTECHNOLOGY SERVICES, INC.  SENSUS CORPORATION

     /s/ Christopher A Kuebler             /s/ William F. Bennett
By:_______________________________    By:_______________________________

       Christopher A Kuebler                  William F. Bennett
Name:_____________________________    Name:_____________________________

        Chairman                               Sr. V.P.
Title:____________________________    Title:____________________________

           7/3/97                              3 July 97
Date:_____________________________    Date:_____________________________



                                      4.

 
                           REVISED SCOPE OF WORK FOR
                              AMENDMENT NO. 1 TO
                       MANUFACTURING SERVICES AGREEMENT
                            WITH SENSUS CORPORATION
                   (CONTAINING PRICES AND PAYMENT SCHEDULE)


SCOPE CONTENTS
                                                       Section    Page

[*]

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      1.

 
                          OVERALL PROGRAM OBJECTIVES

OBJECTIVES

[*]

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                                      2.

 
                                  SECTION 1.
     [*]

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                                      3.

 
[*]

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THE OMITTED PORTIONS.

                                      4.

 
                                      [*]

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WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      5.

 
                                   SECTION 2.

                  TECHNOLOGY TRANSFER/PREPRODUCTION ACTIVITIES

[*]

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                                      6.

 
                  TECHNOLOGY TRANSFER/PREPRODUCTION ACTIVITIES

[*]

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                                      7.

 
                                   SECTION 3.

     [*]

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                                      7.


 
[*]

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THE OMITTED PORTIONS.

                                      9.

 
                                      [*]


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WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      10.

 
                                   SECTION 4.

               CGMP PRODUCTION FOR PHASE III CLINICAL TRIALS AND
                     ESTABLISHMENT OF A REFERENCE STANDARD

[*]

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WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
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                                      11.

 
               CGMP PRODUCTION FOR PHASE III CLINICAL TRIALS AND
                     ESTABLISHMENT OF A REFERENCE STANDARD

[*]

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WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
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                                      12.

 
                                   SECTION 5.

                     FORMULATION AND FILL/FINISH ACTIVITIES

[*]

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                                      13.

 
                     FORMULATION AND FILL/FINISH ACTIVITIES

                                      [*]

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                                      14.

 
                                  SECTION 6.

                          REGULATORY SUPPORT SERVICES


[*]

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WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
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                                      15.

 
REGULATORY SUPPORT

                                      [*]

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WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
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                                      16.

 
                                   SECTION 7

                                      [*]

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                                      17.

 
                                      [*]

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                                      18.

 
                                  SECTION 8.

                                      
[*]

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                                      19.

 
[*]

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WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
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                                      20.

 
STABILITY STUDIES

                                 ESTIMATES FOR
                           KEY MILESTONES AND PRICE

[*]

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WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
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                                      21.

 
                                  SECTION 9.

                                 PRICE SUMMARY

[*]

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WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
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                                      22.

 
                               PAYMENT SCHEDULE

[*]

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WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
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                                      23.

 
[*] CERTAIN INFORMATION IN THIS DOCUMENT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.

                                AMENDMENT NO. 2
                                      TO
                       MANUFACTURING SERVICES AGREEMENT

   Amendment No. 2 dated as of October 3, 1997 (this "Amendment No. 2") between
Covance Biotechnology Services Inc., (f/k/a Corning Bio Inc.), a Delaware
corporation having its principal place of business at 6051 George Watts Hill
Drive, P.O. Box 13865, Research Triangle Park, NC 27709-3865 ("CBSI") and Sensus
Corporation, a Delaware corporation having its principal place of business at 98
San Jacinto Boulevard, Suite 430, Austin, TX 78701 ("Sponsor").

                                  WITNESSETH:

   WHEREAS, CBSI and Sponsor have entered into that certain Manufacturing
Services Agreement dated September 17, 1996 (the "Agreement") wherein CBSI
agreed to perform certain services for Sponsor in connection with the
development of a process for a material known as rhGHA, or B2036-PEG ("Product")
in accordance with the Scope; (terms defined in the Agreement and not otherwise
defined herein are used herein as defined therein); and

   WHEREAS, the Sponsor now wishes to amend the Agreement based upon certain
development results whereby CBSI will undertake further development and
refinement of the manufacturing process and analytical techniques related to the
Product in accordance with the terms of a new scope of work (as defined below)
and CBSI desires to amend the Agreement to provide said process development
services to Sponsor.

   NOW, THEREFORE, for good and valuable consideration the sufficiency and
receipt of which are hereby acknowledged, the parties hereto agree as follows:

   1.  SCOPE OF WORK.  A detailed scope of work document for the development
activities related to the Product (the "Scope") prepared by the parties is
attached to this Amendment No. 2.  CBSI will perform the services as set forth
in the Scope in accordance with the terms and conditions of the Agreement.
Except as expressly modified herein, all terms and conditions of the Agreement
will remain in full force and affect.

   2.  AMENDMENT TO SECTION 6 OF THE AGREEMENT.  Section 6 paragraphs a) and b)
are revised as follows and now read:

   Section 6.
   COMPENSATION
      a)  CBSI will invoice Sponsor on a monthly basis. Invoices will be based
          on
          [*]

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      1.

 
      b)   For any materials needed for the Program that  [*]

  3.  AMENDMENT.  No amendments or modifications to this Amendment No. 2 and no
further amendments or modifications to the Agreement may be made without the
written agreement of the parties hereto.

  IN WITNESS WHEREOF, the parties hereto have executed or caused this Amendment
No. 2 to be executed by their respective officers or other representatives
hereunder duly authorized, as of the date first above written.

 
COVANCE BIOTECHNOLOGY SERVICES INC.:         SENSUS CORPORATION:
 
 
By: /s/ V. Byran Lawlis                      By: /s/ William F. Bennett
   -----------------------------------          --------------------------------

Name: V. Bryan Lawlis                        Name: William F. Bennett
     ---------------------------------            ------------------------------

Title: President & CEO                       Title: Sr. V.P.
      --------------------------------             -----------------------------
                  
[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      2.


 

 
                               SCOPE OF WORK FOR
                              AMENDMENT NO. 2 TO
                       MANUFACTURING SERVICES AGREEMENT
                            WITH SENSUS CORPORATION
                        (CONTAINING ESTIMATED PRICING)

SCOPE CONTENTS                                  SECTION   PAGE
- --------------                                  -------   ----

[*]

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      1.

 
                          OVERALL PROGRAM OBJECTIVES

[*]

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      2.

 
                                   SECTION 1

[*]

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WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      3.

 
                                   SECTION 3

[*]

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                                      4.

 
                                   SECTION 5

[*]

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                                      5.

 
                                   SECTION 7

[*]

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                                      6.

 
                                   SECTION 9

[*]

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                                      7.


[*] CERTAIN INFORMATION IN THIS DOCUMENT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
 
                                AMENDMENT NO. 3
                                      TO
                       MANUFACTURING SERVICES AGREEMENT

Amendment No. 3 dated as of October 24, 1997 (this "Amendment No. 3") between
Covance Biotechnology Services Inc., (f/k/a Corning Bio Inc.), a Delaware
corporation having its principal place of business at 6051 George Watts Hill
Drive, P.O. Box 13865, Research Triangle Park, NC 27709-3865 ("CBSI") and Sensus
Corporation, a Delaware corporation having its principal place of business at 98
San Jacinto Boulevard, Suite 430, Austin, TX 78701 ("Sponsor").

                                  WITNESSETH:

     WHEREAS, CBSI and Sponsor have entered into that certain Manufacturing
Services Agreement dated September 17, 1996 (the "Agreement") wherein CBSI
agreed to perform certain services for Sponsor in connection with the
development of a process for a material known as rhGHA, or B2036-PEG ("Product")
in accordance with the Scope; (terms defined in the Agreement and not otherwise
defined herein are used herein as defined therein); and

     WHEREAS, the Sponsor now wishes to amend the Agreement based upon certain
manufacturing results whereby CBSI will undertake two additional manufacturing
runs of the Product at the 1500-L scale in accordance with the terms of a new
scope of work (as defined below) and CBSI desires to amend the Agreement to
provide said manufacturing services to Sponsor.

     NOW, THEREFORE, for good and valuable consideration the sufficiency and
receipt of which are hereby acknowledged, the parties hereto agree as follows:

1.   SCOPE OF WORK.  A detailed scope of work document for the manufacturing
activities related to the Product (the "Scope") prepared by the parties is
attached to this Amendment No. 3. CBSI will perform the services as set forth in
the Scope in accordance with the terms and conditions of the Agreement. Except
as expressly modified herein, all terms and conditions of the Agreement will
remain in full force and affect.

2.   AMENDMENT TO SECTION 6 OF THE AGREEMENT.  Section 6 paragraphs a) and b)
are revised as follows and now read:

     Section 6.
     COMPENSATION

          e)   The activities specified in the scope attached to this Amendment
          No. 3 will be performed for [*]. The client will be invoiced
          approximately 30 days prior to shipment of the bulk product to the
          fill/finish subcontractor and payment is due prior to shipment of the
          bulk from Covance facilities.

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      1.

 
3.   AMENDMENT.  No amendments or modifications to this Amendment No. 3 and no
further amendments or modifications to the Agreement may be made without the
written agreement of the parties hereto.

IN WITNESS WHEREOF, the parties hereto have executed or caused this Amendment
No. 3 to be executed by their respective officers or other representatives
hereunder duly authorized, as of the date first above written.

COVANCE BIOTECHNOLOGY                        SENSUS CORPORATION
SERVICES INC.

By: /s/ V. Bryan Lawlis                      By: /s/ William Bennett
   ----------------------------                 --------------------------------
Name: V. Bryan Lawlis                        Name: William Bennett
     --------------------------                   ------------------------------
Title: President & CEO                       Title: Sr. VP Mfg.
      -------------------------                    -----------------------------
                      
- --------------------------------------------------------------------------------

                                      2.

 
                       SCOPE OF WORK FOR AMENDMENT NO. 3
                      TO MANUFACTURING SERVICES AGREEMENT
                            WITH SENSUS CORPORATION

[*]

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.



 
          CHANGE ORDER TO AMENDMENT #3 (DATED 24 OCTOBER 1997) OF THE
          MANUFACTURING SERVICES AGREEMENT (DATED 17 SEPTEMBER 1996)

This Change Order to the Sensus Manufacturing Agreement will cover the
activities associated with a fifth (5th) manufacturing run (runs #3 and 4 are
covered in Amendment #3) to produce PEGylated human Growth Hormone Antagonist
(GHA). The activities are as follows:

[*]


The cost for the work described above is [*] excluding reimbursable materials
and project incidentals as defined in the Agreement and subsequent Amendments
and Scopes. This price does not include the costs for performing the fill/finish
activities at the subcontractor or final vial QA/QC release activities. This
price is based upon a significant discount of actual cost for one run.

Approved by:

 /s/ Kirk Hayenga    11/14/97          /s/ William F. Bennett, Ph.D. 20 Nov 97
_______________________________        _______________________________________
Kirk Hayenga                           William F. Bennett, Ph.D.
Program Director - Sensus              V.P. Research and Development
Covance Biotechnology Services         Sensus Corporation

 /s/ Charles T. White, Ph.D.   11/14/97
_______________________________________
Charles T. White, Ph.D. 
V.P. Business Development
Covance Biotechnology Services

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
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THE OMITTED PORTIONS.

                                     


[*] CERTAIN INFORMATION IN THIS DOCUMENT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
 
                                AMENDMENT NO. 4
                                      TO
                       MANUFACTURING SERVICES AGREEMENT

   Amendment No. 4 dated as of December 29, 1997 (this "Amendment No. 4")
between Covance Biotechnology Services Inc., a Delaware corporation having its
principal place of business at 6051 George Watts Hill Drive, P.O. Box 13865,
Research Triangle Park, NC  27709-3865 ("CBSI") and Sensus Corporation, a
Delaware corporation having its principal place of business at 98 San Jacinto
Boulevard, Suite 430, Austin, TX  78701 ("Sponsor").

                                  WITNESSETH:
                                  -----------

   WHEREAS, CBSI and Sponsor have entered into that certain Manufacturing
Services Agreement dated September 17, 1996 (the "Agreement") wherein CBSI
agreed to perform certain services for Sponsor in connection with the
development of a manufacturing process for a material known as rhGHA, or B2036-
PEG ("Product") in accordance with the Scope; (terms defined in the Agreement
and not otherwise defined herein are used herein as defined therein); and

   WHEREAS, CBSI has progressed the development phase of the production process
for Product as defined in the Scope and Sponsor now wishes to amend the
Agreement whereby CBSI will undertake additional manufacturing runs to generate
additional Product in accordance with the terms of a new Scope of Work document
(as defined below) and CBSI desires to amend the Agreement to provide said
manufacturing services to Sponsor.

   NOW, THEREFORE, for good and valuable consideration the sufficiency and
receipt of which are hereby acknowledged, the parties agree to as follows:

   1.  Scope of Work.  A Scope of Work document for the production of Product
       --------------                                                        
(the "Scope") prepared by the parties is attached to this Amendment No. 4.  CBSI
will perform the services set forth in the Scope in accordance with the terms
and conditions of the Agreement.  Except as expressly modified herein, all terms
and conditions of the Agreement will remain in full force and effect.

   2.  Amendment to Section 6 of the Agreement.  Section 6 of the Agreement is
       ----------------------------------------                               
hereby amended as follows:

                                      1.

 
     Section 6.

     COMPENSATION
     ------------

          f)   The activities specified in the scope attached to this Amendment
               No. 4 will be performed for [*]

     3.  Amendment.  No amendments or modifications to this Amendment No. 4
         ----------                                                        
and no further amendments or modifications to the Agreement may be made without
the written agreement of the parties hereto.

IN WITNESS WHEREOF, the parties hereto have executed or caused this Amendment
No. 4 to be executed by their respective officers or other representatives
hereunder duly authorized as of the date first written above.

COVANCE BIOTECHNOLOGY SERVICES INC.          SENSUS CORPORATION

By: /s/ Roy Dagnall                          By: /s/ William F. Bennett
   --------------------------------             ------------------------

Name: Roy Dagnall                            Name: William F. Bennett
     ------------------------------               ----------------------

Title: COO                                   Title: Sr. V.P.
      -----------------------------                ---------------------

Date: 12/30/97                               Date: 31 Dec 97
     ------------------------------               ----------------------

- --------------------------------------------------------------------------------

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                      2.

 
                     SCOPE OF WORK FOR AMENDMENT NO. 4 TO
                     ------------------------------------
                       MANUFACTURING SERVICES AGREEMENT
                       --------------------------------
                            WITH SENSUS CORPORATION
                            -----------------------

BACKGROUND AND PROGRAM OBJECTIVES
- ---------------------------------

[*]


MANUFACTURING PROGRAM FOR AMENDMENT NO. 4
- -----------------------------------------

[*]

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.

                                     

 
Filling is scheduled with the subcontractor on the following dates

          January 30, 1998
          February 27, 1998
          March 27, 1998
          Additional fill dates will be scheduled as needed.


PRICE
- -----

THE PRICE FOR THIS PROGRAM IS [*] AND IS INCLUSIVE OF MATERIALS.

THE ABOVE PRICE DOES NOT INCLUDE THE FOLLOWING:  PROJECT INCIDENTALS AS DEFINED
                     ---                                                       
IN THE AGREEMENT, THE COSTS FOR PERFORMING THE FILL/FINISH ACTIVITIES AT THE
SUBCONTRACTOR OR THE COSTS FOR FINAL VIAL QA/QC RELEASE ACTIVITIES.  THESE ITEMS
WILL BE INVOICED SEPARATELY.


COVANCE BIOTECHNOLOGY SERVICES  SENSUS CORPORATION

Initials: [INITIALS]             Initials: [INITIALS]
         -----------                      -----------
Date: 12/30/97                   Date: 31 Dec 97
     ---------------                  ---------------
- -----------------------------------------------------------------

[*] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY 
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO 
THE OMITTED PORTIONS.
 
                                     


 
         CHANGE ORDER NO. 1 TO AMENDMENT NO. 4 (DATED 29 DECEMBER 1997)
       OF THE MANUFACTURING SERVICES AGREEMENT (DATED 17 SEPTEMBER 1996)


     [*]



     Approved by:


 
      /s/ Kirk Hayenga  2/6/98                /s/ William F. Bennett, Ph.D.
     -------------------------               -------------------------------
     Kirk Hayenga                            William F. Bennett, Ph.D.
     Program Director - Sensus               Sr. V.P. Research and Manufacturing
     Covance Biotechnology Services          Sensus Corporation

      /s/ V. Bryan Lawlis
     ------------------------
     V. Bryan Lawlis
     President & CEO
     Covance Biotechnology Services

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                                      5.


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                                AMENDMENT NO. 5
                                      TO
                       MANUFACTURING SERVICES AGREEMENT

   Amendment No. 5 dated as of May 1, 1998 (this "Amendment No. 5") between
Covance Biotechnology Services Inc., a Delaware corporation having its principal
place of business at 6051 George Watts Hill Drive, P.O. Box 13865, Research
Triangle Park, NC 27709-3865 ("CBSI") and Sensus Corporation, a Delaware
corporation having its principal place of business at 98 San Jacinto Boulevard,
Suite 430, Austin, TX 78701 ("Sponsor").

                                  WITNESSETH:

   WHEREAS, CBSI and Sponsor have entered into that certain Manufacturing
Services Agreement dated September 17, 1996 (the "Agreement") wherein CBSI
agreed to perform certain services for Sponsor in connection with the
development of a manufacturing process for a material known as rhGHA, or B2036-
PEG ("Product") in accordance with the Scope; (terms defined in the Agreement
and not otherwise defined herein are used herein as defined therein); and

   WHEREAS, the Agreement and the Scope were amended according to the provisions
of Amendment No. 1 dated July 3, 1997 to include initial production runs of the
Product using Process 1 and were amended according to the provisions of
Amendment No. 2 dated October 3, 1997 to provide for the development of a new
manufacturing process ("Process 2") for the manufacture of the Product and were
further amended according to Amendment No. 3 dated October 24, 1997 and
Amendment No. 4 dated December 29, 1997, to provide for and additional
production runs of the Product utilizing Process 1; and

   WHEREAS, Sponsor now wishes to amend the Agreement and Scope whereby CBSI
will perform manufacturing runs to generate additional Product via Process 2 in
accordance with the terms of a new Scope of Work document (as defined below) and
CBSI and Sponsor desire to amend the Agreement to provide said manufacturing and
services.

   NOW, THEREFORE, for good and valuable consideration the sufficiency and
receipt of which are hereby acknowledged, the parties agree to as follows:

   1.  SCOPE OF WORK.  A Scope of Work document for the manufacture of Product
(the "Scope") prepared by the parties and dated May 1, 1998 is attached to this
Amendment No. 5 and incorporated herein by reference.  CBSI will perform the
services set forth in the Scope in accordance with the terms and conditions of
the Agreement.  Except as expressly modified herein, all terms and conditions of
the Agreement will remain in full force and effect.

                                      1.

 
     2.  AMENDMENT TO SECTION 6 OF THE AGREEMENT.  Section 6 of the Agreement is
hereby amended to add Section 6 paragraph g) as follows:

     Section 6.

     COMPENSATION

     g)  The activities specified in the scope attached to this Amendment No. 5
         will be performed for the prices detailed in each section of the Scope
         and summarized in the Scope, Section 7. CBSI will invoice Sponsor upon
         completion of a priced unit of activity, such as completion of a lot of
         frozen cell paste or completion of a lot of prePEGylated bulk, but not
         more frequently than monthly. Payments are due 30 days from the date of
         invoice. [*] Subcontractor charges, such as for cell line testing, will
         be invoiced in the month that CBSI is invoiced by the subcontractor.
         Late payments are subject to an interest charge of one percent (1%) per
         month.

     3.  CHANGE ORDERS.  The Agreement is hereby amended to incorporate an
additional section, Section 25, as follows:

     Section 25.

     CHANGE ORDERS

     a)  The estimated budget for the Program specified in the Scope and the
         individual budget components and time estimates specified in the Scope
         are subject to a number of general and program specific assumptions.
         The program specific assumptions relate to the Program design and
         objectives, manpower requirements, timing, capital expenditure
         requirements, if any, and other matters relating to the completion of
         the Program as set forth in the Scope (the "Program Assumptions"). CBSI
         also assumes that the Sponsor will cooperate and perform its
         obligations under the Agreement and Scope in a timely manner, that no
         event outside the control of CBSI will occur, including, without
         limitation, the events described in Section 16, Force Majeure, and that
         there are no changes to any applicable laws, rules or regulations which
         effect the Program (the foregoing assumptions together with the Program
         Assumptions, collectively, the "Assumptions"). In the event that any of
         the Assumptions require modification or the Program objectives cannot
         be achieved based on the Assumptions (each being, a "Modification")
         then the Scope may be amended as provided in paragraph b) of this
         Section 25.

     b)  In the event a Modification is identified by the Sponsor or by CBSI,
         the identifying party shall notify the other party as soon as is
         reasonably possible. CBSI shall provide Sponsor with a Change Order
         containing an estimate of the required Modifications to the Program
         budget and timeline specified in the Scope within 20 business days of
         receiving such notice. Sponsor shall use best efforts to respond in
         writing to such Change Order promptly. If Sponsor

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                                      2.

 
          does not approve such Change Order and has not terminated the Program
          but wants the Program to be modified to take into account the
          Modification, then Sponsor and CBSI shall use best efforts to agree on
          a Change Order that is mutually acceptable.  If practicable, CBSI
          shall continue work on the Program during any such negotiations, but
          shall not commence work with respect to the Change Order unless
          authorized in writing.

     4.   AMENDMENT.  No amendments or modifications to this Amendment No. 5 and
no further amendments or modifications to the Agreement may be made without the
written agreement of the parties hereto.

IN WITNESS WHEREOF, the parties hereto have executed or caused this Amendment
No. 5 to be executed by their respective officers or other representatives
hereunder duly authorized as of the date first written above.

COVANCE BIOTECHNOLOGY SERVICES INC.         SENSUS CORPORATION        
                                                                      
By: /s/ V. Bryan Lawlis                     By: /s/ William F. Bennett
   --------------------------------------      --------------------------------
Name: V. Bryan Lawlis                       Name: William F. Bennett
     ------------------------------------        ------------------------------
Title: President & CEO                      Title: Sr. VP
      -----------------------------------         -----------------------------
Date: 5/11/98                               Date: 13 May 98
     ------------------------------------        ------------------------------

                                      3.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

                      SCOPE OF WORK FOR AMENDMENTS NO. 5

                      TO MANUFACTURING SERVICES AGREEMENT

                            WITH SENSUS CORPORATION

[*]

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                                      1.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

SECTION 1:  TECHNOLOGY TRANSFER

[*]

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                                      2.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

SECTION 2:  PERFORMANCE OF SHAKEDOWN RUNS

[*]

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                                      3.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

SECTION 3:  PROCESS 2 PRODUCTION RUNS

        [*]

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                                      4.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

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                                      5.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

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                                      6.


                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

SECTION 4:  FILL FINISH ACTIVITIES

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                                      7.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

SECTION 5:  QA AND QC TESTING AND FINAL RELEASE ACTIVITIES

Covance will utilize QA and QC resources as necessary to support production and 
release PEGylated rhGHA:

        [*]

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                                      8.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

SECTION 6:  VALIDATION/QUALIFICATION ACTIVITIES

A proposal for validation activities leading to NDA filing is being prepared and
will be forwarded to Sensus, however, there is a certain amount of
validation/qualification that needs to be performed for the upcoming Process 2
campaign.

The objectives for the limited process validation/qualification for Process 2 
are:

[*]

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                                      9.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

SECTION 7:  PRICE AND PAYMENT SCHEDULES

                              Overall Scope Price

[*]

[*]

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                                      10.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

                         ANTICIPATED INVOICE SCHEDULE
                         ----------------------------

                                     [ * ]

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                                      11.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

REPLACEMENT LOTS AND MANUFACTURING SUCCESS RATES

        [*]

COVANCE BIOTECHNOLOGY SERVICES                    SENSUS CORPORATION

Initials: [INITIALS]                              Initials: [INITIALS]
         -----------                                       -----------

Date:  5-11-98                                     Date: 13 May 98
     ---------------                                     ---------------

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                                      12.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

                                 ATTACHMENT TO
                       SCOPE OF WORK FOR AMENDMENT NO. 5

                                TESTING SUMMARY

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                                      13.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

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                                      14.

 
                                                                    SENSUS SCOPE
                                                                 Amendment No. 5

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                                      15.