The DNA of these cousins upended a previously held idea. But the new study focused on the burials of four children, who lived as the Stone Age transitioned into the Metal Age also called the Stone-to-Metal Age in western Central Africa. About one-third of their DNA came from ancestors who were more closely related to hunter and gatherers in western Central Africa. This realization is unique to this dataset, and hasn't been found from previous genetic studies, the researchers said. For instance, one of the boy's genomes revealed that he had the oldest branch of the Y chromosome, which shows that the oldest lineage of human males was present in Cameroon for at least 8, years, and possibly much longer, the researchers said. The study, led by scientists at Harvard Medical School, was published online today Jan. The other two-thirds came from an ancient source in West Africa, including a "long lost ghost population of modern humans that we didn't know about before," study senior researcher David Reich, a population geneticist at Harvard University, told Science magazine.
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