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Male DNA is commonly found in the brains of women, a study has found.
The cause of the phenomenon is most likely being pregnant with a boy, say scientists.
No one yet knows the medical implications of the discovery. But there is a suggestion that male DNA in the female brain might protect against Alzheimer's disease.
Other kinds of "microchimerism", the harbouring of genetic material and cells swapped between foetus and mother during pregnancy, have been linked to both beneficial and harmful effects.
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