A-B: Sections of hearts were triple-stained with DAPI (nuclei), antibodies to GFP and cardiomyocyte markers tropomyosin (A) or α-actinin (B) 4 weeks post-transplantation. C: Sections of hearts were triple-stained with DAPI, antibodies to GFP and smooth muscle cell marker smooth muscle actin (SMA) 4 weeks post-transplantation. D: Sections of hearts were triple-stained with DAPI, antibodies to GFP and endothelial cell marker von-Willebrand Factor (vWF) 4 weeks post-transplantation. Scale bars represent 50 µm. DAPI: 4′,6-diamidino-2-phenylindole.