One DNA study by Nebel found genetic evidence in support of historical records that "part, or perhaps the majority" of Muslim Palestinians descend from "local inhabitants, mainly Christians and Jews, who had converted after the Islamic conquest in the seventh century AD".[110] They also found substantial genetic overlap between Muslim Palestinians and Ashkenazi and Sephardic Jews, though with some significant differences that might be explainable by the geographical isolation of the Jews or by immigration of Arab tribes in the first millennium.