Exhibit 1
JOINT FILING AGREEMENT
The persons below hereby agree that the Schedule 13D to which this agreement is attached as an exhibit, as well as all future amendments to such Schedule 13D, shall be filed jointly on behalf of each of them. This agreement is intended to satisfy the requirements of Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934.
Dated: January 8, 2018
| GRIFOLS, S.A. | ||
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| By: | /s/ David I. Bell | |
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| Name: | David I. Bell |
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| Title: | Authorized Signatory |
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| GRI-CEL, S.A. | ||
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| /s/ Alfredo Arroyo | |
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| Name: | Alfredo Arroyo |
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| Title: | Authorized Signatory |
