Sesquiterpene lactones specifically inhibit activation of NF-kappa B by preventing the degradation of I kappa B-alpha and I kappa B-beta - Hehner,S.P.; Heinrich,M.; Bork,P.M.; Vogt,M.; Ratter,F.; Lehmann,V.; Schulze-Osthoff,K.; Dröge,W.; Schmitz,M.L. (Journal of Biological Chemistry, 1998)