Primary human umbilical vein endothelial cells (HUVEC) were purchased from Cell Applications (200K-05), primary human saphenous vein endothelial cells (HSaVEC) and human aortic endothelial cells (HAoEC) from PromoCell (C-12231 and C-12271, respectively) and human coronary arterial endothelial cells (HCoEC) from Lonza (CC-2585). All cells were cultured in Microvascular Endothelial Cell Growth Medium-2 (complete medium, EGM-2MV, Lonza) and used for no more than 5 passages (16 (link)).