female

Male DNA is commonly found in the brains of women, most likely derived from prior pregnancy with a male fetus. While the medical implications of male DNA and male cells in the brain are unknown, the harboring of genetic material and cells that were exchanged between fetus and mother during pregnancy has been linked to autoimmune diseases and cancer, sometimes for better and other times for worse.

Researcher William F. N. Chan says that his findings support the likelihood that fetal cells frequently cross the human blood-brain barrier and that what scientists call "microchimerism" in the brain is relatively common.
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