Medical Dictionary


noun ac·ti·vin \ˈak-ti-ˌvin, ak-ˈti-vən\

Medical Definition of activin

  1. :  a glycoprotein hormone produced especially in the pituitary gland and gonads that stimulates the secretion of follicle-stimulating hormone, induces the formation of mesoderm during embryological development, and modulates the proliferation and differentiation of red-blood-cell precursors during hematopoiesis—compare inhibin

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