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Neighbor-Joining tree of 153 dominant clones representing individual patients and 45 reference sequences from GenBank. Bootstrap test was done with 500 replicates and shown at major branches. Among 153 patients, 38 were infected with HCV genotype 1b and 115 were genotype 1a. The latter was further clustered into three subgroups with more than 90% bootstrap support. EVR, early virologic response.
