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Scanning electron microscope images showing the cell morphology of cardiomyocytes (A-C), cardiomyocytes-mesenchymal stem cells co-culture cells (D-F) and mesenchymal stem cells (G-I) grown on tissue culture plate (A, D, G), collagen nanofibers (B, E, H) and poly (glycerol sebacate)/collagen core/shell fibers (C, F, I) on day 15 at 500 × magnification.
