Balance between pro- and antiinflammatory-cytokines in the colonic mucosa in inflammatory bowel diseases (IBD): T. Andus, R. Daig, G. Lock, S. Hollerbach, I. Caesar, D. Vogl, E. Aschenbrenner, H. Fenner∗, J. Schölmerich, V. Gross. Dept. for Int. Med. I, Univ. of Regensburg, FRG, ∗Hoffmann La-Roche, Basle, Switzerland