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Ratio of the transcontinental subgroup (grey) to the Japanese subgroup (white) of HTLV-1 cosmopolitan subtype in various localities of East Asia. The data of Nogliki, Kakeroma, Taiwan, Kinmen and Fujian were cited from Syrtsev et al. [10], Eguchi et al. [13], Yang et al. [7], Chen et al. [9] and Wang et al. [11], respectively.
