Recent studies suggest that D-M55 was the majority lineage of the Jōmon people at a frequency of about 70%. The average frequency in Japanese is about 33%. High frequencies are found in various places in Japan, especially in Hokkaidō, eastern Honshū, and Okinawa. A Jōmon man excavated from Funadomari remains (about 3,800 - 3,500 YBP) in Rebun Island in Hokkaido belongs to Haplogroup D1b2a(D-CTS220). This discovery proved the hypothesis that Haplogroup D-M55 is a Jōmon lineage. A study published in the “Journal for archeological science” by Boulygina et al. 2020 analyzed ancient Koban burials and found a high number of lineage D1a2 (D-M55) which is common among the Ainu people in Japanand southeastern Russia. By ISOGG tree（Version: 14.151）.