Nat. Rev. Gastroenterol. Hepatol. 7, 380–400 (2010); doi:10.1038.nrgastro.2010.80 In the July 2010 issue of Nature Reviews Gastroenterology & Hepatology, there were two errors in the Review article by Per Brandtzaeg. In Figure 8, the arrow referred to in part 3 of the legend is cited incorrectly. The legend should read “(3) Some APCs extend their dendrites between epithelial cells to sample luminal antigens.