Myostatin, a transforming growth factor-beta superfamily member, is expressed in heart muscle and is upregulated in cardiomyocytes after infarct. - Sharma,M.; Kambadur,R.; Matthews,K.G.; Somers,W.G.; Devlin,G.P.; Conaglen,J.V.; Fowke,P.J.; Bass,J.J. (J Cell Physiol, 1999)