Sharma,M., Langley,B., Bass,J. and Kambardur,R. (2001). Myostatin in muscle growth and repair. Exerc. Sport Sci. Rew., 29,4,155-158. Myostatin, a member of the TGF beta superfamily, regulates skeletal muscle size by controlling embryonic myoblast proliferation. Recent results show that myostatin may also have a role in muscle regeneration and muscle wasting of adult animals. This review summarizes the recent developments in the regulation of myostatin gene expression and mechanism of its function.