FN1 and myeloid sarcoma: The presence of fibronectin aggregates in gm MS lesions remains to be determined, but based on the less inflammatory character of gm lesions75, the absence of fibronectin immunoreactivity in marmoset gm EAE lesions77 and our present findings, it is tempting to hypothesize that in gm MS lesions less remyelination-impairing fibronectin aggregates are formed than in (chronic) wm MS lesions.