3.3% to 8% from the heterogeneous Jōmon period tribes) and cluster closely with other Koreans and Han-Chinese, but are slightly with shifted towards eastern Siberians. Based on archaeological evidence and the genetic similarity between modern Japanese and Koreans, Jared Diamond said that the Yayoi people, the ancestors of the Yamato people, migrated from the Korean peninsula. Watanabe et al. 2021 found that the Jōmon people were a heterogeneous population and that Japanese from different regions had different amounts of Jōmon-derived SNP alleles, ranging from 17.3% to 24% samplified by southern Jōmon, and 3.8% to 14.9% samplified by northern Jōmon. Southern Jōmon were genetically similar to contemporary East Asians (especially Tujia people, Tibetan people and Miao people), while northern Jōmon had a partial distinct ancestry component, possibly deriving from Paleolithic Siberians, next to an East Asian ancestry component. The Jōmon period population, although heterogeneous, were closest to contemporary East Asians and Native Americans. In 2021, new research from a study published in the journal Science Advances found that the people of Japan bore genetic signatures from three ancient populations rather than just two as previously thought. The first was Japan's indigenous culture of hunter-gatherers called the Jomon, dating to roughly 15,000 years ago. The second was a population of Northeast Asian origins called the Yayoi, who arrived at about 900 BC, bringing wet-rice farming to Japan. According to the researchers, Japanese people has approximately 13% and 16% genetic ancestry from these two groups respectively. The remaining 71% of genetic ancestry was found to come from migrants that arrived around 300 AD during the Kofun period, and had genetic makeup mainly resembling the Han Chinese population of China. This migrant group was said to have brought cultural advances and centralised leadership to Japan. According to Shigeki Nakagome, co-leader of the study, "Chinese characters started to be used in this period, such as Chinese characters inscribed on metal implements, for example swords." A new study in 2022 conducted by the University of Xiamen shed light on the lack of Jōmon genomes found in present-day Koreans and Japanese. Researchers discovered that despite finding evidence of the Jōmon people on the Korean peninsula and the Japanese archipelago, there were little to no traces left of their genetic impact in their respective people's gene pools. According to the study, Ancient Koreans were composed of "northern East Asian-related ancestry and indigenous Jōmon-related ancestry" where the "northern East