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Comparison of sarcomeric structures of cardiomyocytes derived from rESCs and mESCs or isolated from rat fetal hearts by immunofluorescence staining of α-actinin (upper panel), cTnT (middle panel), and cMHC and Mef2c (lower panel). Nuclei were stained with Hoechst 33258 (blue). Scale bars = 25 μm. rESCMs, rESC-derived cardiomyocytes; rFCMs, rat fetal cardiomyocytes; mESCMs, mESC-derived cardiomyocytes.
