One further study isolated T cells with dual specificity for the EBV DNA polymerase protein BALF5 and MBP epitopes, which were restricted by the MS risk antigen HLA‐DRB1*15: 01 and HLA‐DRB5*01: 01, respectively, from the blood of an MS patient,102 and was subsequently found to be expanded in CSF.103. This evidence concerns the gene MBP and myeloid sarcoma.