金山科研平台，产品价格货期咨询微信：jinshanbio Molecule Information: Follistatin Aliases: FS; FST Entrez Gene IDs: 10468 (Human); 14313 (Mouse) Background: Follistatin Follistatin (FS) was initially identified as a follicle-stimulating hormone inhibiting substance found in ovarian follicular fluid. FS is a high-affinity activin-binding protein that can act as an activin antagonist. Two alternatively spliced follistatin mRNAs exist, encoding mature FS with 288 amino acid (aa) residues (FS-288) and 315 aa residues (FS-315). Natural FS purified from porcine ovaries is primarily a carboxy-terminal truncated form of FS-315 composed of 300 aa residues.