activin - Dictionary definition and pronunciation - Yahoo! Education
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ac·ti·vin  audio  (kt-vn, k-tvn) KEY 

NOUN:
A polypeptide growth factor that is synthesized in the pituitary gland and the gonads and stimulates the secretion of follicle stimulating hormone.
ETYMOLOGY:
activ(ate) + (inhib)in ( from its activating follicle stimulating hormone)


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