endothelial cell lineactivated endothelial cellsendothelial progenitor cellsmicrovascular endothelial cellsendothelial cells functioncirculating endothelial cellsepithelial and endothelial cellsfenestrated endothelial cellssinusoidal endothelial cellscapillary endothelial cellsvascular endothelial cellsendothelial cell culture