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The rate of positive seroconversion expressed in percentage among immunized mice groups. Mice sera were assayed for anti-HBsAg and a cut-off at ≥10 mIU/mL was set as positive. The seroconversion rate was calculated by dividing the number of mice (anti-HBsAg ≥ 10 mIU/mL) on the total number of mice in each group. Data points represent mean ± SD from three independent experiments.
