CD8A and myeloid sarcoma: Stainings performed in our laboratory using the in situ pentamer technique and HLA class I-matched postmortem brain tissue from progressive MS cases have revealed enrichment of CD8 T cells specific for a broad range of EBV latent and lytic protein-derived peptides, but not CD8 T cells recognizing CMV and influenza A virus peptides, in active white matter lesions and in the meninges (63).