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Fluorescent image of an actively contracting embryonic chicken cardiomyocyte transfected with α-actinin–GFP. The fusion protein localizes to the Z-bands of the mature contracting myofibrils, the Z-bodies of the premyofibrils (arrowheads), and an intercalated disc (arrow) that is shown in phase-contrast in the inset (arrow). (Bar = 5 μm.)
