- This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This proceedings article has been retracted at the request of the authors as most of the data presented had already appeared in a paper entitled “Vitamin D decreases NFκB activity by increasing IκBα levels”. M. Cohen-Lahav, S. Shany, D. Tobvin, C. Chaimovitz and A. Douvdevani, Nephrol. Dial. Transpl., 21 (2006) 889–897, doi:10.1093/ndt/gfi254, due to their misunderstanding of the respective publishing and copyright policies of the journal and a conference proceedings publication.