FIG. 1.

Flow cytometric analysis of MHC class II expression on HT1080 cells by simultaneous treatment with IFN-γ and infection with HPIV3. HT1080 cells (5 × 10⁵ cells/ml) were infected or not with HPIV3 (MOI of 1.0) and IFN-γ (100 U/ml) either alone or together and harvested at 72 h postinfection for MHC class II assay. Untreated cells served as the control. In each panel, the MFI and the percentage of cells staining for MHC class II are indicated. Results are representative of three independent assays. NT, not treated.