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Effect of endothelial progenitor cells (EPCs) with or without per2 on mouse cardiac function 4 weeks after myocardial infarction (MI). (A) LV ejection fraction, (B) fractional shortening, (C) LV diastolic internal dimension and (D) LV systolic internal dimension. (E) Representative M-mode findings 4 weeks after MI (*P < 0.05, **P < 0.01 versus sham, ##P < 0.01 versus MI+PBS, $$P < 0.01 versus MI+wild-type EPCs; n = 6 per group).
