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Ultrastucture of clam cultured cells after 4 days. Myofilaments ( 
) in a cardiomyocyte (a). Details of a cardiomyocyte with longitudinal myofibrilla of striated appearance (b). Cyt cytoplasm, M mitochondria, N nucleus, RER rough endoplasmic reticulum, glycogen-like particles (▽). Scale bars 20 μm for a and 5 μm for b
