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Relative changes in the expression levels of MyHC IIx mRNA in the masseter (A) and gastrocnemius (B) muscles at 1, 2, 3, 4, and 8 weeks of age in the mi/mi (dotted line) and +/+ (solid line) mice. Each point and its vertical bar represent the mean ± S.D. of six samples. Significant difference between mi/mi and +/+, *p<0.05. Arrows indicate the period of weaning.
