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Comparison of the size of the triceps surae muscle in the MM phenotype (left; Mouse ID 53283; body mass = 20.4 g, age = 66 days) and in normal (right; Mouse ID 53277; body mass = 26.1 g, age = 66 days) mice. The muscles of the MM phenotype are ∼50% the mass of normal muscles (0.055 versus 0.129 g). Scale bar = 1 mm. Supplementary online figure is in color.
