The two statements from the article that represent reasons that directly support the author's claim are:
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"'If we don't include ethnically diverse populations, we are potentially going to be exacerbating health inequalities,' said Sarah Tishkoff, study coauthor and a human geneticist at the University of Pennsylvania."
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"And health treatments that don't take the variations of genetically diverse populations into account can cause problems."
These statements highlight the implications of a lack of diversity in genetic research and how it can lead to negative health outcomes and inequalities.