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Recently, Tsukiyama-Kohara et al. (1993) reported that most hepatitis C viruses (HCVs) in Japan can be classified into two types, type 1 and type 2, on the basis of the NS4 region nucleotide sequence. They developed a new assay in which antibodies against group-specific recombinant proteins of the NS4 region were measured by ELISA (serologically defined genotype, serotype). In the present study,...
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