SUMMARYThe synthesis of P-~~C(U) tyrosinelarginine vasotocin at a specific activity of 102 mCi/mMole was performed using the solid-phase approach of Merrifield for peptide synthesis. cation by gel filtrations the labeled hormone was recovered at an average yield of 40X with an avian vasodepressor activity of 408 2 24 Ulmg.
Following purifi-