Source:http://linkedlifedata.com/resource/umls/id/C1159888
GO: The process in which a mesodermal, bone marrow or neural crest cell acquires specialized features of an endothelial cell, a thin flattened cell. A layer of such cells lines the inside surfaces of body cavities, blood vessels, and lymph vessels, making up the endothelium. [CL:0000115, GOC:go_curators]