activin
noun
ac·ti·vin
ˈak-ti-ˌvin, ak-ˈti-vən 
: 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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“Activin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/activin. Accessed 27 Dec. 2024.
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