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Antibody isotypes from IFN-γ+/+ and IFN-γ−/− C57BL/6 mice are identical. C57BL/6 mice (IFN-γ+/+ [black bars] and IFN-γ−/− [light gray bars]) were immunized with 3 × 106 PFU of MV (Edmonston strain). Isotypes of MV-specific antibodies in the sera of immunized mice were determined by an MV-specific ELISA (error bars indicate standard deviations). OD, optical density.
