has part has part has quality has quality output of output of produced by produced by lipid lactation quality of a liquid casein derived peptide mammary gland milk ENVO:02000031 BTO:0000868 GAID:1230 UMLS:C1511310 FMA:62100 CALOHA:TS-0636 mammary gland milk MIAA:0000056 MAT:0000056 MESH:D008892 MA:0002552 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. NCIT:C13401 An emulsion of fat globules within a fluid that is secreted by the mammary gland during lactation. VHOG:0001263 UBERON:0001913 Wikipedia:Breast_milk EMAPA:36540 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] galen:Milk EV:0100126 ncit:Milk refers specifically to cow milk bodily fluid mammary gland fluid/secretion