Some genes have more than one copy, and the copy number can differ among individuals. But does this variation affect the person involved? It seems susceptibility to certain common diseases can be altered.
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Nadeau, J., Lee, C. Copies count. Nature 439, 798–799 (2006). https://doi.org/10.1038/439798a
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DOI: https://doi.org/10.1038/439798a
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