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Putative cardiac stem cells. Shown are detection of c-kit (A,
green), MDR1 (B, purple), and Sca-1-reactive protein (C,
yellow) in primitive cells (arrows) of hypertrophied hearts. Nuclei are
stained by propidium iodide (PI; blue) and myocytes by cardiac myosin (red).
(Bars = 10 μm.)