Increased mucosal tumour necrosis factor alpha production in Crohn's disease can be downregulated ex vivo by probiotic bacteria. - Borruel,N.; Carol,M.; Casellas,F.; Antolin,M.; Lara,F de.; Espin,E.; Naval,J.; Guarner,F.; Malagelada,J.R. (Gut, 2002)