the specifically 13c-labeled ( 90 % 13c-enriched ) peptide hormone derivatives [ 1-hem [ 2-13c ] cystine ] oxytocin , [ 1-hemi [ 1-13c ] cystine ] oxytocin , and [ 2- [ -2-13c ] tyrosine [ -oxytocin and the analogue [ 3- [ 2-13c ] leucine ] oxytocin were prepared by total synthesis and used to study the interactions of the neurohypophyseal hormones with the bovine neurophysins as a function of ph and temperature .
C0030095
oxytocin
C0032017
neurohypophyseal hormones