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1153 B cells were infected with WR or A35Δ virus for 5 h, washed and incubated with no primary antibody, anti-class II MHC, or anti CD45 and then FITC-conjugated secondary and analyzed by flow cytometry. Mean fluorescence intensities (MFI) for MHC class II were: Un 154, A35Δ 111, and WR 77.
