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A simple and specific detection method for multiple forms of cystine aminopeptidase (oxytocinase-isoenzymes) in pregnancy serum is described using S-benzyl-L-nitroanilide as substrate. The relative distribution of both cystine aminopeptidase isoenzymes at different stages of pregnancy is given.

A Specific Detection Method for Multiple Forms of Cystine Aminopeptidase (Oxytocinase-Isoenzymes) after Polyacrylamide Gel Electrophoresis