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Serial transverse sections of the tibialis anterior muscles in the normobaric ((a) and (b)) and hyperbaric ((c) and (d)) mice at 90 weeks. (a) and (c), stained for ATPase activity following preincubation at pH 4.5; (b) and (d), stained for succinate dehydrogenase activity. a: type IIA; b: type IIB. Scale bar = 50 μm.
