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RT-PCR analysis on IFN-γ-inducible expression of promoter III-derived (Pro III) and promoter IV-derived (Pro IV) CIITA (38 cycles of PCR) and GAPDH (28 cycles of PCR) in small cell lung cancer (SCLC), neuroblastoma (NB), and non-SCLC cell lines. Cultured cancer cells were treated with 500 units/ml IFN-γ for 24 hours.
