 From mainland Japanese people, the MtDNA haplogroup frequencies are most occurring in the D4 haplogroup, with about 33%, with the second largest frequency in the B4 haplogroup, containing about 9%, and the third largest frequency in the M7a haplogroup, occurring at about 8%.The rest of the other haplogroup frequencies are much smaller than D4, with frequencies ranging from about 3-5%, consisting of mostly N9a, M8, and M9 haplogroups.Between the different Japanese populations, the Yayoi population has the highest haplogroup frequencies of the D4 haplogroup.