Follistatin 1mg 95% Purity Follistatin also is known as activin-binding protein is a protein that in humans is encoded by the FST gene. Follistatin is an autocrine glycoprotein that is expressed in nearly all tissues of higher animals. Its primary function is the binding and biol neutralisation of members of the TGF-β superfamily, with a particular focus on activin, a paracrine hormone. An earlier name for the same protein was FSH-suppressing protein (FSP). At the time of its initial isolation from the follicular fluid, it was found to inhibit the anterior pituitary secretion of follicle-stimulating hormone (FSH).