Percentage inhibition of the HLA-A2- and HLA-DR1-restricted lytic
activity of T cell clone MBM15, using saturating concentrations of
different mAbs. The cytotoxicity of MBM15 against the
HLA-A2+ EBV-PH (hatched bars), the HLA-DR1+
EBV-WO (open bars), and the HLA-DR1+ EBV-WT (filled bars)
were, respectively, 54%, 31%, and 40% at an E/T ratio of 3:1.