Scientists have known for years that during pregnancy, cells from the developing fetus can wind up in the mother’s bloodstream. But a newer study shows that fetal cells can also travel to specific organs, such as the heart, lungs, skin … and even the brain, where they can become integrated among the mother’s neuronal cells permanently.
This process is known as “microchimerism.” (The name comes from Greek mythology, in which Chimera was a creature that was part serpent, part lion and part goat.) Microchimeric cells were first noticed in humans when cells containing the male Y chromosome were found in the blood of mothers after a pregnancy (these foreign cells can live in the mother’s bloodstream for years after a pregnancy).
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