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Tokita et al. reported the identification of hepatitis C virus type 7, 8 and 9 in Southeast Asia, based on the unweighed pair-group method with the artihmetic mean, a method that may not be appropriate when the nucleotide substitution rate is not constant over time. To determine more accurately the relationship of these proposed types 7, 8, and 9 with other types, a more appropriate approach, the...
Hepatitis B virus (HBV) surface antigen (HBsAg), which is encoded by the HBV S gene, is conventionally classified into 4 serological subtypes, adw, adr, ayw and ayr. To determine the relationship between the HBsAg seroreactivity and the nucleotide sequence diversity of the HBV S gene, the nucleotide sequences of S genes for HBV isolates reported so far were aligned with each other. The numbers of...
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