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Micrographs of representative cross-sections of the rectus abdominis muscle of the bottlenose dolphin (Tursiops truncatus) after histochemical staining: (A) myosin ATPase in acidic pre-incubation solution, (B) myosin ATPase in alkaline pre-incubation solution, and (C) succinic dehydrogenase. Muscle fiber-types are categorized as: I, slow-twitch; II, fast-twitch; IIa, fast-twitch oxidative-glycolytic; IIb, fast-twitch glycolytic.
