An emulsion of fat globules within a fluid that is secreted by the mammary gland during lactation.
Comment:
[homology-note] "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]" xsd:string {date_retrieved="2012-09-17", external_class="VHOG:0001263", ontology="VHOG", source="ISBN:978-0072528305 Kardong KV, Vertebrates: Comparative Anatomy, Function, Evolution (2006) p.224", source="http://bgee.unil.ch/"}