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The gene expression of cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) in HT-29, HCT 116, and SW480 cells. The real-time quantitative reverse transcription PCR (qRT-PCR) assay has indicated that CTLA-4 expression in the SW480 cells is substantially higher than the HT-29 and HCT 116 cells. N.S: non-significant, *** p < 0.001, and **** p < 0.0001.
