Woman discovers that her blood is genetically male, baffling the scientific community: Doctors in Brazil found that a 35-year-old woman’s blood carried male chromosomes, even though her body looked entirely female. The mismatch surfaced after a pregnancy loss, when clinicians ordered chromosome testing to look for a genetic clue in blood. Testing across her tissues showed two genetic lineages, pointing to chimerism, two sets of genes living #EarthDotCom #EarthSnap #Earth

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