Milk genes: Why only some of us can drink milk | Genetic Literacy Project - 0 views
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Lottie Peppers on 25 Apr 16It is, when you think about it, sort of weird that nearly all mammals lose the ability to digest milk early in life. The Class Mammalia is, after all, defined by the gland that produces this life-giving fluid-supplier not only of necessary nutrients but also of water and molecules that protect against continual assaults from invading organisms.