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Balanced against that, finding cancers early and treating them can save lives. But it's difficult for doctors to work out which cancers are going to be aggressive and spread, which means men can be treated unnecessarily.
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Not every modern human has the same set of Neanderthal DNA, however; different people will, by chance, have inherited different fragments. But there are also some areas, termed "Neanderthal deserts," where none of the Neanderthal DNA seems to have persisted. Notably, the largest Neanderthal desert is the entire X chromosome, raising questions about whether this reflects the evolutionary fitness of genes there or mating preferences.
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