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Muscle fiber-type composition of aged ephrin-A3−/− muscles is nearly indistinguishable from aged wild-type (WT) muscles. Percentage of type I (A), IIa (B), IIx (C), IIb (D), and I/IIa (E) hybrid fibers in tibialis anterior (TA), extensor digitorum longus (EDL), gastrocnemius (GAS), plantaris (PLN), and soleus (SOL) muscles. Data are presented as means ± SE. *P < 0.05; ***P < 0.001.
