ERVW-1 and myeloid sarcoma: Regarding RR-MS patients (Figures 3A, B), we found a positive significant correlation between anti-HHV-6A/B IgM antibodies titers and pHERV-W ENV/syncytin-1 protein expression levels in NK cells (r=0.310, p=0.009) and T lymhpocytes (r=0.282, p=0.016).