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Anti-WHcAg response in woodchucks WH282 and WH564 after immunization with pWHcIm. Vaccinations with plasmids are indicated with ▿ (100 μg) and ▾ (1 mg). Sera from woodchucks were used for titration of anti-WHcAg (WH282 [▴]; WH564 [▵]) by serial dilution.
