SUBSTITUTE POWER OF ATTORNEY Pursuant to a written power of attorney, a copy of which was previously filed (the "Power of Attorney"), the undersigned, Jean Liu, has been constituted and appointed true and lawful attorney-in-fact, with full power of substitution and revocation, to do and perform every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of the rights and powers granted in said Power of Attorney, by the following individual: Nancy Simonian, MD Know all by these presents, that, pursuant to the powers granted to the undersigned in the Power of Attorney, the undersigned hereby constitutes and appoints each of Jessica Nielsen Causey and Jennifer Prosba as a substitute to the undersigned attorney-in-fact, with full power of substitution or revocation, and with full power and authority to do and perform every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of the rights and powers granted to the undersigned in said Power of Attorney. For the avoidance of doubt, the foregoing appointment shall not serve as a revocation of the powers granted to the undersigned in the Power of Attorney. This Substitute Power of Attorney shall remain in full force and effect unless and until revoked by the undersigned. IN WITNESS WHEREOF, the undersigned has caused this Substitute Power of Attorney to be executed as of this 2nd day of September, 2021. Signature: /s/ Jean Liu ---------------- Name: Jean Liu
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4 Filing
Simonian Nancy A Form 4Seagen / Nancy A Simonian ownership change
Filed: 4 Mar 22, 5:09pm