“…In addition, cardiomyocytes were striated with well-organized Z-lines (marked by α-Actinin in Fig. 5 F and G), suggesting that the fabricated cardiac tissue had developed and maintained intact myofibril structures, which is the physiological basic for heart contraction [ 18 , 19 ]. Cardiac differentiation from hESCs in the bioreactor also generated VE-Cadherin + endothelial cells, which were deeply buried inside the cardiac muscles ( Fig.…”