Recognition of the SW 872 sarcoma cell line by the SSX-2_41-49-specific clone D2.5. Recognition was assessed in a chromium release assay in the absence (closed circles) or in the presence (open circles) of exogenously added peptide SSX-2_41-49 (1 µM) at the indicated effector to target cell ratio. Melanoma lines T567A and T465A were used as control target cells.