Specific reactivity of 3 HB-1H.B44 peptide-induced autologous CD8⁺ CTL lines. Cytolytic activity was tested in chromium release assays against autologous PHA-stimulated T-cell blasts either pulsed with 5 μM HB-1H.B44 or HB-1Y.B44 peptide, and autologous EBV-transformed B-cell lines that endogenously express HB-1H. K562 was used to determine aspecific lysis.