milk An emulsion of fat globules within a fluid that is secreted by the mammary gland during lactation. BTO:0000868 CALOHA:TS-0636 EMAPA:36540 ENVO:02000031 EV:0100126 FMA:62100 GAID:1230 MA:0002552 MAT:0000056 MESH:A13.622 MIAA:0000056 NCIT:C13401 OpenCyc:Mx4rvVjGZJwpEbGdrcN5Y29ycA The detailed similarities of mammary glands in living monotremes, marsupials, and eutherians argue for a monophyletic origin of these glands, perhaps by the combination of parts of preexisting sebaceous and sweat glands.[well established][VHOG] UBERON:0001913 UMLS:C1511310 VHOG:0001263 galen:Milk mammary gland milk ncit:Milk refers specifically to cow milk to axiomatize the different forms of mammary gland secretion an ontology of the phases of pregnancy/lactation is required. Using the existing GO def of lactation is circular. uberon bodily fluid mammary gland fluid/secretion