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The endogenous RT activity in the virions of mutants. The original values are calculated by dividing the viral DNA amount by the viral RNA amount in virions. Relative amount to WT of early (R-U5: A) and late (2nd Tfer :B) products of RT are shown. The data are the average of at least three independent experiments, and the error bars represent SEM. The statistical significance was evaluated by a Student’s t-test. *P < 0.05; **P < 0.01.
