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Cross-sections of the hindlimb muscles in control (left) and exercise (right) rats. The first line is left (ipsilateral) soleus in control and exercise rats. The second line is left plantaris in control and exercise rats. The third line is right (contralateral) soleus in control and exercise rats. The fourth line is right plantaris in exercise and control rats. Dark=Type I muscle fiber, light=Type II muscle fiber (Myosin ATPase straining, 100×).
