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5-Bromo-2′-deoxyuridine (BrdU) uptake in proliferating fetal sheep cardiomyocytes in vitro. After 48-hour incubation with BrdU, positive myocytes are marked by fluorescein isothiocyanate (green) staining in the nuclei of cells that also stained for myosin (red). Image shown is at ×400 magnification.
