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FST, also known as Follistatin, has a 344 amino acid long isoform that is 38 kDa and a short 317 amino acid that is 35 kDa, functions as an activin antagonist binding directly to it and inhibits the biosynthesis and secretion of pituitary follicle stimulating hormone (FSH). Studies of this protein are being performed in relation to polycystic ovary syndrome, pituitary adenoma, insulin resistance, Down syndrome, plasmacytoma, lymphocytic leukemia, pituitary tumor infertility, endometrial carcinoma, teratocarcinoma, azoospermia, meningitis, hepatocellular carcinoma, ovarian carcinoma, liver disease, endometriosis, prostate carcinoma, prostatitis, ovarian cancer, and adenoma. This protein has been also shown to have interactions with ANG, DIP2A, BMP4, FN1, and TXN in signal transduction activin A signaling regulation and TGF-beta signaling pathways.