Researchers Show How Active Immune Tolerance Makes Pregnancy Possible

(PhysOrg.com) -- The concept of pregnancy makes no sense -- at least not from an immunological point of view. After all, a fetus, carrying half of its father's genome, is biologically distinct from its mother. The fetus is thus made of cells and tissues that are very much not "self" -- and not-self is precisely what the immune system is meant to search out and destroy.

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