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Electron micrographs of P3-P8 rat cardiomyocytes (cm). Left panel, subsarcolemmal fibrils, variable-sized mitochondria, and centrosome (arrow). Bar = 2 µm. Panels with mitoses with clumped chromatin (cr), dispersed myofibrils small mitochondria, and pale cytoplasm. Capillaries (cap) are dilated due to perfusion fixation. Endothelial cell mitosis (end).
