Dictionary of Human Evolution and Biology

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Gonadotropic polypeptide hormone secreted by the anterior pituitary gland that stimulates and sustains lactation in postpartum mammals, the mammary glands having been prepared by other hormones. It also stimulates formation of crop milk substance in the crop sac of birds such as doves and pigeons, is luteotropic in certain mammals, and has many other effects, including essential roles in the maintenance of immune-system functions. Aka galactopoietic hormone, lactogenic hormone, lactation hormone, lactogen, luteotropic hormone, lactotropin, luteotropin, mammotropin. The structure of hPRL shows some sequence identity with human growth hormone (hGH).

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From "Dictionary of Nursing and Individual Health Care"