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The differentiation of Sca-1+ CSCs under the microscope (A – blank group; B – miRNA-21 mimic group; C – miRNA-21 inhibitor group; D – negative control group). Under the microscope, the Sca-1+ CSCs in blank, miRNA-21 mimic, miRNA-21 inhibitor, and NC groups did not differentiate into functional cardiomyocytes.
