A study by the University of Chicago found that Arab populations, including Palestinians, Jordanians, Syrians, Iraqis, and Bedouin, have at least some sub-Saharan African genes. Non-Arabs from the region, including Turks, Kurds, Armenians, Azeris, Georgians, and Jews did not have any African roots. A possible explanation is the proximity of the Arabian peninsula to the Black African nations. This conclusion is favored by the fact that Yemenite Arabs have 35% Black African genes in their mtDNA (which passes through the mother), while others have less. Yemen, of course, is very close geographically to several Black African nations. Other Arabs, especially those far away from the Arabian peninsula, have as little as 10% African blood in their mtDNA. As such, it is possible that the African gene was merely diluted by the introduction of non-Arab (and non-African) genes to the pool when Arabs began to conquer other Middle East people after the rise of Islam. The “real” Arabs — those who have Arab ancestors stretching beyond the last 1,400 years – are actually 35% Black in their mtDNA. These Arabs are from the Arabian peninsula.