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The replication of human herpesvirus-6 (HHV-6) DNA is catalyzed by the viral DNA polymerase pU38 and the processivity factor pU27 which stabilizes the enzyme on the DNA template. The genetic polymorphism of pU27 among 46 clinical strains of HHV-6 variant A or B and four strains resistant to antivirals was investigated. Overall, 28 amino acid changes (7.6%) and a two-amino acid deletion were identified...
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