endothelial cell linereticulo endothelial cellsactivated endothelial cellsendothelial progenitor cellsendothelial cells functioncirculating endothelial cellsepithelial and endothelial cellsfenestrated endothelial cellssinusoidal endothelial cellscapillary endothelial cellsvascular endothelial cellsendothelial cell culture