Live Science
"Richards and his colleagues analyzed mitochondrial DNA, which is contained in the cytoplasm of the egg and passed down only from the mother, from more than 3,500 people throughout the Near East, the Caucusus and Europe, including Ashkenazi Jews.
The team found that four founders were responsible for 40 percent of Ashkenazi mitochondrial DNA, and that all of these founders originated in Europe. The majority of the remaining people could be traced to other European lineages."
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