Assertion: oxytocin | /r/CapableOf | act on breast
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text: Oxytocin is a small peptide hormone, made up of 9 amino acids, secreted by the hypothalamus and passing into the posterior pituitary gland, and thence into the bloodstream where it acts on various target organs such as the breasts, the uterus, on various erectile tissues, and directly on other neurons in the brain.