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Myostatin (Mstn) is a secreted growth factor belonging to the tranforming growth factor (TGF)-beta superfamily. Inactivation of murine Mstn by gene targeting, or natural mutation of bovine or human Mstn, induces the double muscling (DM) phenotype. In DM cattle, Mstn deficiency increases fast glycolytic (type IIB) fiber formation in the biceps femoris (BF)(More)
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