FOR IMMEDIATE RELEASE                    CONTACT:  Gary Hamlin
- ---------------------                              DowElanco
FEBRUARY 20, 1996                                  (317) 337-4799
                                                        

                                                   Greg D. Taylor
                                                   The Lubrizol Corporation
                                                   (216) 943-4200
 
                                                   Michael Sund
                                                   Mycogen Corporation
                                                   (619) 453-8030


                 MYCOGEN, DOWELANCO FINALIZE STRATEGIC ALLIANCE

     INDIANAPOLIS -- DowElanco, Mycogen Corporation (Nasdaq: MYCO) and The
Lubrizol Corporation (NYSE: LZ) today completed transactions through which
Mycogen acquired DowElanco's United AgriSeeds seed business and DowElanco took
approximately a 46 percent equity stake in Mycogen.

     Mycogen issued approximately 4.5 million shares of Mycogen common stock to
DowElanco in exchange for United AgriSeeds and cash.  In a separate transaction,
DowElanco purchased all of the 9.5 million shares of Mycogen common stock owned
by Lubrizol.  Mycogen also reacquired certain rights in oil seed technology from
SVO Specialty Products, Lubrizol's specialty oils subsidiary.  DowElanco will
hold approximately 13.9 million of the 30.4 million outstanding shares of
Mycogen common stock, and may acquire additional Mycogen common shares within
certain restrictions.

     "The key to this alliance is our shared commitment to agriculture," said
Jerry Caulder, Mycogen's chairman and chief executive officer.  "That common
purpose and the power of biotechnology will produce many exciting innovations to
help farmers around the world meet the rapidly growing demand for food and
fiber."

     John Hagaman, DowElanco's president and chief executive officer, said, "our
vision for DowElanco is leadership in global agriculture, and this new alliance
is a tangible example of DowElanco's movement toward new technology that will
shape the future."

     Caulder said United AgriSeeds and Mycogen Seeds will create an entity that
had 1995 sales of more than $100 million and ranked third in U.S. seed corn
sales.

     "We are bringing United AgriSeeds and Mycogen Seeds together for seed
production this year and will combine operations and sales for 1997," said Carl
Eibl, Mycogen's president and chief operating officer.  "Mycogen now has a
strong operating platform to commercialize value-added biotechnology seed
traits."

     Mycogen is a diversified agricultural biotechnology company that develops
and markets technology-based products and provides crop protection services to
control agricultural pests and improve food and fiber production.  Mycogen Seeds
is a leader in developing crop plants with genetically enhanced pest-resistance.
It is now marketing the first hybrid seed corn genetically engineered with
Bacillus thuringiensis (Bt) genes that produce a protein that gives corn plants
built-in resistance to European corn borer, a major pest in corn production.

     DowElanco, with global sales of $2 billion, is a research-based
agricultural and specialty pest management company with significant research
initiatives aimed at insect, weed and plant disease management.
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