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A fetus needs to defend itself against foreign bodies—so how does it avoid attacking its mother?

External Link - Source: Science

The immune system of a fetus developing in the womb faces a quandary: It has to prepare itself to attack dangerous pathogens after birth, by distinguishing its own cells from those of invaders. But until that time, it needs to avoid attacking the mother, whose cells are also “foreign.” A new study of fetal tissue has revealed one way the developing immune system keeps itself in check: by interrupting the production of a key weapon in the body’s arsenal against invaders.

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