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Figure 1: Regenerated myocardium formed by c-kit-positive human cardiac stem cells. Three weeks after injection of c-kit-positive human cardiac stem cells, labeled with enhanced green fluorescent protein (EGFP), into the border zone of the infarcted rat heart. Regenerated human cardiomyocytes (arrowheads) expressed EGFP together with alpha-sarcomeric actin (α-SA) and are distinguished from surviving rat myocytes possessing α-SA only (asterisks) [9].