Changes in expression and distribution of claudin 2, 5 and 8 lead to discontinuous tight junctions and barrier dysfunction in active Crohnʼs disease - Zeissig, S; Bürgel, N; Günzel, D; Richter, J; Mankertz, J; Wahnschaffe, U; Kroesen, A J; Zeitz, M; Fromm, M; Schulzke, J D (Gut, 2007)