Oxytocin-SAP (Cat. #IT-46) is a conjugate (molecular weight 31 kDa) between the native oxytocin peptide and saporin. Oxytocin is a nine amino acid peptide with a structure similar to vasopressin, and is a hormone released by the posterior pituitary. Peripheral activity of oxytocin is linked primarily to lactation and labor-related uterine contractions. Within the brain, oxytocin receptor-positive neurons have been studied with regard to their sensitivity to leptin and involvement in satiety.