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In a broader comparison of populations from every region of Asia, the aforementioned cluster is subsumed in a Northeast and East Asian cluster that also includes the Koryak, Chukchi, Reindeer Chukchi, Nganasan, Samoyed, Northern Tungus, Nentsy, N. Most Koreans were hard to distinguish from Japanese, and the study was not able to clearly distinguish Koreans and Japanese.
Koreans and Japanese clustered together in the principal component analysis and the best least-squares tree.
The study said that "[c]ommon ancestry and/or extensive gene flow" historically between Koreans and Japanese appears to be "likely" and results in a lot of difficulty finding population-specific alleles that could assist in differentiating Koreans and Japanese.
Hideo Matsumoto, professor emeritus at Osaka Medical College, tested Gm types, genetic markers of immunoglobulin G, of Korean populations for a 2009 study.
Studies of polymorphisms in the human Y-chromosome have so far produced evidence to suggest that the Korean people have a long history as a distinct, mostly endogamous ethnic group, with successive waves of people moving to the peninsula and three major Y-chromosome haplogroups.
Among the populations of East Asia, The Italian-born American geneticist Cavalli-Sforza of Stanford University placed Koreans in a cluster of populations including the Japanese, Ryukyuans, Ainus, Tibetans, and Bhutanese, with smallest genetic distance from the Ryukyuans and the Japanese from Hokkaido. (2005) did a study about the genetic relationships among East Asians based on allele frequencies, particularly focusing on how Chinese, Japanese and Koreans are related.
(2017) said that the Ulchi people are genetically closest in the study's panel to the human remains from the Devil's Gate Cave which are dated to about 7,700 years ago.
However, in contrast to western Eurasians, the southern people did not supplant the northern people, but rather the two groups intermingled." Veronika Siska et al.The research found that the people in Devil's Gate Cave were the ancestors of the Ulchi people, and the research team said that the Ulchi people have a genetic structure which is the closest to modern Koreans.Bhak said, "Thousands of years ago East Asian hunter gatherers expanded over all of Asia, as far as Russia in the north, and formed the northern race.Thus, on the basis of remarks made by President Kim Il-sung in 1977 concerning school attendance, the population that year was calculated at 17.2 million persons.During the 1980s, health statistics, including life expectancy and causes of mortality, were gradually made available to the outside world.