FN1 and myeloid sarcoma: In conclusion, the observed appearance of immunoreactive TG2 in monocytes in active white matter lesions during marmoset EAE, in combination with its co-expression with β1-integrin and close association to extracellular FN, strongly suggests an important role for TG2 in the adhesion, migration and/or differentiation of infiltrating monocytes during EAE, and possibly MS.