Epitope sequences and lysis of Y-1- or K-11-selected populations. Populations (A) obtained from the first Y-1 selection. B. Second Y-1 selection. C. First K-11 selection. Numbers (parentheses) and types of epitope sequences isolated from CTL-selected populations are shown. The CTL selected populations or control cell lines, B6/K-0 or B6/K-1,4,5, were combined with the indicated CTL clones (Y-1, K-11, or K-19 for A and B; K-11, K-19 or H-1 for C) in standard four hour cytotoxicity assays.