Dr. Daniel G. Blackburn is the world's expert on the early evolution of
lactation -- see his main web page at this URL

http://shakti.trincoll.edu/~blackbur/

His research clearly shows that mammary glands are not derived from sweat
glands and milk is not modified sweat.  Researchers used to think so, but
not any more.

Kathy Dettwyler
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