Targeting dipeptidyl peptidase IV (CD26) suppresses autoimmune encephalomyelitis and up-regulates TGF-beta 1 secretion in vivo - Steinbrecher, A; Reinhold, D; Quigley, L; Gado, A; Tresser, N; Izikson, L; Born, I; Faust, J; Neubert, K; Martin, R; Ansorge, S; Brocke, S (J Immunol, 2001)