endothelial
adjective medical specialized uk/ˌen.dəʊˈθiː.li.əl/ us/ˌen.doʊˈθiː.li.əl/
内皮的，内皮层的
relating to the endothelium (= the thin layer of cells that line the blood vessels, heart, and some body cavities)
endothelial cells 内皮细胞