Individuals of the following Asian populations were surveyed for the presence of a 9-base-pair deletion of mitochondrial DNA (mtDNA): Ainu, Japanese, Korean, Negrito, and Vedda. Although the variation was detected in every population except the Vedda, the frequencies of the variation differed widely among the populations, suggesting a geographic cline.
Harihara, Shinji; Hirai, Momoki; Suutou, Yumiko; Shimizo, Koji; and Omoto, Keiichi
"Frequency of a 9-bp Deletion in the Mitochondrial DNA among Asian Populations,"
2, Article 2.
Available at: http://digitalcommons.wayne.edu/humbiol/vol64/iss2/2