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Published online 25 October 2004 | Nature | doi:10.1038/news041025-1
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Duck-billed platypus boasts ten sex chromosomes
Odd mammal hints at evolutionary origin of sex determination.
Everyone knows that the duck-billed platypus is pretty strange. But it seems this mammal's eccentricities extend beyond its famous bill, and habit of laying eggs, to the way its genes determine sex.
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