metafilter: anti-microbial snot mixed in with a lot of fat and sugar
May 20, 2006 2:49 AM
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the origin of fun bags.The age old question of where breasts came from
may have finally been answered!
[boobs] first evolved as an immunoprotective gland that produced bacteriocidal secretions to protect the skin and secondarily eggs and infants, and that lactation is a highly derived kind of inflammation response. [...] Milk is actually a kind of anti-microbial snot mixed in with a lot of fat and sugar.
All vertebrates have an innate immune system consisting of molecules which are hostile to microbes. It appears that the nutritional content of the milk is a product of mutation and repurposing of these immunological molecules! Xanthine oxidoreductase, which produces natural preservatives and disinfectants is also responsible for the essential role of encapsulating fat droplets which promotes suspension in water. Lactose (sugar) "requires a specific synthetic complex consisting of β-1,4 galactosyltransferase and α-lactalbumin for its production." As it turns out, α-lactalbumin is a modified (mutated) version of an awesome little molecule that literally skins bacteria alive - lysozyme!
posted by Tryptophan-5ht (127 comments total)
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posted by Muirwylde at 2:52 AM on May 20, 2006