to non-Jewish Ethiopians are consistent with the view that the Beta Israel people descended from ancient inhabitants of Ethiopia who converted to Judaism." Another 2001 study did, however, find a possible genetic similarity between 11 Ethiopian Jews and 4 Yemenite Jews from the population samples. DNA analysis further determined that modern Jews of the priesthood tribe — "Cohanim" — share a common ancestor dating back about 3,000 years. This result is consistent for all Jewish populations around the world. The researchers estimated that the most recent common ancestor of modern Cohanim lived between 1000 BCE (roughly the time of the Biblical Exodus) and 586 BCE, when the Babylonians destroyed the First Temple. They found similar results analyzing DNA from Ashkenazi and Sephardi Jews. The scientists estimated the date of the original priest based on genetic mutations, which indicated that the priest lived roughly 106 generations ago, between 2,650 and 3,180 years ago depending whether one counts a generation as 25 or 30 years. A study of Ashkenazi mitochondrial DNA by Richards et al. (2013) suggested that, though Ashkenazi paternal lineages were of Middle Eastern origin, the four main female Ashkenazi founders had descent lines that were established in Europe 10,000 to 20,000 years in the past while most of the remaining minor founders also have a deep European ancestry. The majority of Ashkenazi maternal lineages were not brought from the Levant, nor recruited in the Caucasus, but were assimilated within Europe. The study estimated that 80 percent of Ashkenazi maternal ancestry comes from women indigenous to Europe, 8 percent from the Near East, and the remainder undetermined. According to the study these findings 'point to a significant role for the conversion of women in the formation of Ashkenazi communities.' Some geneticists, such as Doron Behar, a geneticist at Gene by Gene in Houston, US, and Karl Skorecki, at the Technion - Israel Institute of Technology in Haifa, are skeptical of these results. A 2014 study by Fernández et al. found that Ashkenazi Jews display a frequency of haplogroup K in their maternal DNA, suggesting an ancient Near Eastern matrilineal origin, similar to the results of the Behar study in 2006. Fernández noted that this observation clearly contradicts the results of the 2013 study led by Richards that suggested a European source for 3 exclusively Ashkenazi K lineages. A study by Haber et al. (2013) noted that while previous studies of