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Phenotypic properties of electrocytes and muscle fibers in normal adult tail. Serial cross sections (12 μm thick) of a fish tail immunolabeled with AE1 (anti-keratin; A), MF20 (anti-MHC; B), and CH1 (anti-tropomyosin;C). Keratin (A) was found only in electrocytes (EC). Muscle fibers (asterisks) expressed sarcomeric MHC (B) and tropomyosin (C), two proteins not detected immunohistochemically in electrocytes. Scale bar, 100 μm.
