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Geographical distribution of sub-haplogroups of D. gallinae in Japan based on 16S rRNA sequences. Proportions of 4 sub-haplotypes, AJ1, AJ2, BJ1 and BJ2, found in 40 prefectures are shown in pie charts on map. The prefecture names are shown with sample numbers in brackets. The sub-haplogroups AJ1 and BJ1 were found all over Japan. AJ2 was found only in two adjacent prefectures, Hyogo and Okayama. BJ2 was mainly distributed in the western area of Chiba prefecture.
