Impact of 5-AZA-CdR on CTA expression in sarcoma cells and recognition by CTLs. (A) RT-PCR analysis of untreated tumor cells or cells treated with 5-AZA-CdR. (B) Antigen recognition of SW 872 sarcoma cells by CTA-specific CTLs in the absence (white bars) or presence (dashed bars) of 1 µg/ml of the corresponding peptide.