high-performance liquid chromatography ( hplc ) is being used extensively to characterize active polypeptides , precursor processing mechanisms , and cooperative peptide-protein noncovalent complexes in neuroendocrine pathways for neurohypophysial peptide hormones , oxytocin and vasopressin , and the hormone-associated proteins , neurophysins .
C0032017
neurohypophysial
C0030095
oxytocin