I was reading a textbook on lactation the other day and found this:
It seemed surprising that human milk SIgA antibodies often are directed against just about any bacteria present in the gut. This was explained when it was discovered that lactogenic hormones important for the development of the mammary glands towards the end of pregnancy directly influence the migration of lymphocytes from the aggregates of lymphocytes in the gut to the mammary glands. This is called the entero-mammaric link and results in SIgA antibodies in the milk being directed against bacteria in the mother's gut and bacteria arriving there from her upper respiratory tract secretions.
In other words, toward the end of pregnancy, hormones cause lymphocytes in the mothers gut to migrate to the breasts, so that at birth the breasts can start making milk which contains antibodies against the things which the mother's gut already fights. This was discovered in 1978. Cool.
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