CTL clone RDR173 recognizes an mHag presented in HLA-B7. (A) EBV-LCL cells preincubated with antibodies against HLA class I, HLA class II, or HLA B and C alleles were tested for recognition by CTL clone RDR173. (B) EBV-LCL cells expressing one or more HLA class I alleles in common with the patient (A2, A3, B7, B60, Cw3) were incubated with CTL clone RDR173 for 24 hours. Release of IFN-γ was determined by using ELISA. HLA alleles that are shared with the patient are depicted in bold.