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WB F344 cells co-cultured with neonatal cardiac cells. A: Proliferating WB F344 cells that attached away from cardiac cells formed nests of undifferentiated WB F344 cells (black triangle). B and C: Differentiating WB F344-derived cardiomyocytes (blue cell) adjacent to neonatal cardiomyocytes. C: Binucleated, WB F344-derived cardiomyocyte. D: WB F344-derived cardiomyocyte expressing GFP. Original magnifications, ×40.
