Studying protein key ins the blood of individuals categorized as West Eurasians, Africans, East Asians, South Asians, Native Americans, Oceanians and Australians, he identified that “around 85 percent of variation in the protein types could be accounted for by variation within populations and races, and only 15 percent by variation throughout them,” David Reich, a Harvard University geneticist, wrote in the New York Times in 2018. “To the level that there was variation among human beings, he concluded, many of it was since of differences in between individuals.”.