Some ethnic differences could be down to the same genes behaving differently.

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Spielman R. S., et al. Nature Genet., published online 7 January 2007. doi:10.1038/ng1955 (2007).
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Check, E. Genetic expression speaks as loudly as gene type. Nature (2007). https://doi.org/10.1038/news070101-8
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DOI: https://doi.org/10.1038/news070101-8