part_of part of part of multicellular organism anatomical entity sebum UMLS:C0036511 waterproofs skin NCIT:C13276 MA:0002538 Fatty lubricant matter secreted by sebaceous glands, and made of made of triglyceride oils, wax, squalene, and metabolytes of fat-producing cells[BTO,WP]. UBERON:0001866 The composition of sebum varies across species. In humans, the lipid content is as follows: 25% wax monoesters, 41% triglycerides, 16% free fatty acids, 12% squalene; Sapienic acid is a sebum fatty acid that is unique to humans. MESH:D012629 FMA:61304 GAID:1168 Wikipedia:Sebaceous_glands#Sebum ENVO:02000037 BTO:0001981