Immunomodulatory effects of the liver: deletion of activated CD4 + effector cells and suppression of IFN-gamma-producing cells after intravenous protein immunization - Klugewitz,K.; Blumenthal-Barby,F.; Schrage,A.; Knolle,P.A.; Hamann,A.; Crispe,I.N. (J Immunol, 2002)