Oxytocin: A Cyclic Nonapeptide Hormone and Neurotransmitter Profiled

Oxytocin is a cyclic nonapeptide hormone and neurotransmitter, recognized as the principal uterine-contracting and milk-ejecting hormone of the posterior pituitary. It is also believed to influence social cognition and behavior, and acts as a vasodilator. This profile details its fundamental biological classification and established physiological roles.