The Woman with TWO Sets of DNA

This is blowing my mind. Ana Paula Martins, through a blood test, discovered she has XX chromosomes in every cell of her body…except her blood, where she carries XY chromosomes.

She is female through and through: she presents female, has all functioning biologically female body parts, yet only in her blood she has XY chromosomes.

It was a medical mystery to the geneticists who were investigating her case until Martins revealed a crucial detail…she is a twin.

Now Martins is one of the only,