One of the common mutations causing factor XI deficiency in Ashkenazi-Jews (type II) is also prevalent in Iraqi Jews, who represent the ancient gene pool of Jews - Shpilberg, O; Peretz, H; Zivelin, A; Yatuv, R; Chetrit, A; Kulka, T; Stern, C; Weiss, E; Seligsohn, U (Blood, 1995)