ID 3.4.11.3 DE cystinyl aminopeptidase. AN cystine aminopeptidase. AN cystyl-aminopeptidase. AN oxytocinase. CA Release of an N-terminal amino acid, Cys-|-Xaa-, in which the half- CA cystine residue is involved in a disulfide loop, notably in oxytocin or CA vasopressin. Hydrolysis rates on a range of aminoacyl arylamides exceed CA that for the cystinyl derivative, however. CC -!- Belongs to peptidase family M1. DR Q9UIQ6, LCAP_HUMAN ; Q8C129, LCAP_MOUSE ; P97629, LCAP_RAT ; //