
Keywords: رتینوئیک اسید; BBB; blood-brain barrier; CNS; central nervous system; hPSCs; human pluripotent stem cells; BMECs; brain microvascular endothelial cells; P-gp; P-glycoprotein; RA; retinoic acid; UM; unconditioned medium; EC; endothelial cell; ECÂ +Â RA medium; EC mediu