Abstract
In 1991, I co-authored a minireview which appeared in this journal and dealt with two protein factors that had recently been isolated from ovarian follicular fluid (1). The two proteins, activin and follistatin, were discovered in the context of their effects on the reproductive system to stimulate and inhibit, respectively, the secretion of follicle-stimulating hormone (FSH) from the anterior pituitary gland (2–5).
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