The percentage of specific cytotoxicity of PBMC-derived T-cell lines against HIV env-, RT-, and gag-expressing autologous target cells measured just before the infusion and at 2 and 18 hours after the infusion and at later time points. No data are shown for subject 226, whose specific cytotoxicity against these targets was below background at all times. The background lysis of control targets expressing the lacZ gene was subtracted to determine the HIV-specific cytotoxicity, depicted at an E:T ratio of 25:1.