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HLA-DR induction in SV40 fibroblasts: WT/WT, I87T/I87T, 818del4/WT, P and 131delC/131delC SV40-transformed fibroblasts from were stimulated with the indicated dose of IFN-γ for 48 h. HLA-DR induction was determined by FACS analysis. Gray area: no stimulation (NS); thin line: 103 IU/ml IFN-γ; bold line: 105 IU/ml IFN-γ.
