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One gene keeps us either male or female

Researchers have found that the body is in a constant fight to remain either female or male and the suppression of just one gene could cause it to "flip" from one to the other.

The remarkable findings refute the generally held view that sex is determined at birth and is irreversible in later life.

They could also lead to treatments for certain gender disorders in children, early menopause in women and even eventually non-surgical sex changes.

In mammals, males have XY chromosomes and females XX. The new research shows that another gene is responsible for switching women into men.

If the FOXL2 is switched on then the body grows ovaries, switched off and they are replaced by testicles.

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