Cytokines produced by CTL in presence of DA1-3b/d365 cells. CTLs were obtained from mice on day 35 after inoculation; DA1-3b/d365 cells were obtained from mice on day 365 after inoculation. Quantification by ELISA of (A) IFN-γ, (B) TNF-α, and (C) IL10, with blocking antibodies against B7-H1 or B7.1. Error bars indicate standard deviation.