Activin A/AB/B Activin A/AB/B:FST Follistatin (FST) binds Activin Authored: May, B, 2012-09-21 Edited: May, B, 2012-09-21 Pubmed12697670 Pubmed1592877 Pubmed16198295 Pubmed7678220 Pubmed8033815 Reactome Database ID Release 432473184 Reactome, http://www.reactome.org ReactomeREACT_150395 Reviewed: Chen, Ye-Guang, 2012-11-14 Two molecules of Follistatin (FST) bind an Activin dimer in serum or follicular fluid (Schneyer et al. 1992, Krummen et al. 1993, Schneyer et al. 1994, Thompson et al. 2005). FST has been experimentally shown to bind Activin A and Activin B (Schneyer et al. 2003). Binding of FST to Activin AB is inferred. has a Stoichiometric coefficient of 2