Dissecting the function of B cells in the MS mouse model experimental autoimmune encephalomyelitis (EAE) is largely confined to induction with either the myelin oligodendrocyte glycoprotein epitope MOG35–55 or the full-length recombinant human MOG protein, the latter representing the most-used B cell-dependent EAE model. Here, MOG is linked to myeloid sarcoma.