Intact regulatory function of IFN-γ on HLA class I expression in OVACs. OVAC 16 was untreated or treated with IFN-γ for 48 hours and then stained for the expression of total HLA class I, HLA-A2, and HLA-A11. Stainings of untreated cells (dashed line) and IFN-γ–treated cells (dotted line) are shown. Isotype control stainings are depicted as a solid line. Histograms from one representative staining out of three of this particular tumor is shown.