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(Science: protein) A peptide hormone (1007 D) from hypothalamus: transported to the posterior lobe of the pituitary (see neurophysin). Induces smooth muscle contraction in uterus and mammary glands. Related to vasopressin. Hormone secreted by the posterior pituitary gland (trade name Pitocin); stimulates contractions of the uterus and ejection of milk.A type of [[hormone produced by the [[ pituitary gland which causes contraction of the [[ uterine wall, and is found dur.