Right, the reference is: Zerjal T, Xue Y, Bertorelle G, Wells RS, Bao W, Zhu S, Qamar R, Ayub Q, Mohyuddin A, Fu S, Li P, Yuldasheve N, Ruzibakeiv R, Xu J, Shu Q, Du R, Yang H, Hurles ME, Robinson E, Gerelsaikhan T, Dashnyam B, Mehdi SQ, Tyler-Smith C. The genetic legacy of the Mongols. Am J Hum Genet 2003; 72 (3): 717-721. The paper actually talks about the results of a study concerning the Y-chromosome, but, as the DIA gene is "common" within Mongolia, the extension is, I feel, justifiable. :):)