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Female chromosome has X factor
By Julianna Kettlewell
BBC News science reporter
The X chromosome can protect - or harm - your health, depending on what sex you are
Females are genetically more varied than males, an analysis of the X chromosome has revealed.
A large team of scientists has published a detailed profile of the DNA bundle in Nature magazine.
They found that female mammals, who possess two copies of the X chromosome, express more genes than males, who only have one X and a Y chromosome.
They also said that females were protected from many diseases because of their double dose of the X chromosome.
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