Abstract

Previous studies have suggested that an aromatic amino acid residue at position 2 in oxytocin facilitates the expression of the hormone's biolgocial activities. [2-Tryptophan]-oxytocin, in which a residue of tryptophan has replaced that of tyrosine in oxytocin, has been synthesized by the method of azide coupling of the N-terminal dipeptide and C-terminal heptapeptide amide. It was found to have approximately 0.1% of the potency of oxytocin in milk ejection and uterotonic biological activities.

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