EX-4.3(B) 8 a2236551zex-4_3b.htm EX-4.3(B) EXECUTION COPY REGISTRATION RIGHTS AGREEMENT DATED AS OF NOVEMBER 17, 2017 BY AND AMONG Y-MABS THERAPEUTICS, INC., WECO GROUP A/S, MARK UNGER AND LAMBERTO ANDREOTTI REVOCABLE TRUST Page

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