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Oxytocin is a nonapetide closely related to vasopressin (Mohr E et al, 1985; Sausville E et al, 1985). It is best known for its roles in female reproduction: it is released in large amounts during labour facilitating birth and afterwards, breastfeeding. It also acts as a neurotransmitter in the brain. The actions of oxytocin via the oxytocin receptor (Kimura T et al, 1992) are mediated by G proteins which activate a phosphatidylinositol-calcium second messenger system.