S100A8 and myeloid sarcoma: This is an intriguing finding as this is the only antigen (amongst 7 with differential recognition between patients and controls) which is recognized more often in MS patients than HCs; all other antigens - including p120-CagA, p67-FSH, p54-flagellin, p50, p41 and p29-UreA- are more frequently recognized in HC than MS group (or its subgroup).