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Mean (+ SE) myostatin mRNA levels, gastrocnemius muscle mass, and quadriceps muscle mass after tamoxifen administration to Mstn[f/f] and Mstn[w/w] mice (n = 4–6 mice/condition). Time points refer to interval after the end of tamoxifen-induced Cre recombinase activation. *P < 0.001 for difference between Mstn[f/f] and Mstn[w/w] groups.
