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Effect of exogenous IFN-γ on MHC class II expression in IFN-γ-deficient mice. The mice infected i.p. with 5 × 105 N. caninum tachyzoites were treated with 0 (A), 500 (B), and 5,000 (C) U of recombinant IFN-γ every day. The MHC class II expression on Mac-1 α chain+/CD45R/B220− cells was examined at 3 dpi.
