A, Representative photographs of jelly-rolled colons of Nlrp6−/− and wildtype (WT) mice sacrificed on day 10 and day 13 of the AOM/DSS tumor induction protocol under 250× magnification (left). Single arrows denote mucosal ulceration, dashed arrows point to submucosal edema, and thick arrow indicate regenerating crypts within the mucosa. Histologic scoring based on extent of mucosal ulceration, submucosal edema, and inflammatory cell infiltration was performed (N=5 mice/group/timepoint) treated with AOM/DSS and sacrificed on days 10 through 13 after the first round of DSS (right). C, Colons from sex- and age-matched Nlrp6−/− and wildtype (N=5 mice/group) were harvested on day 13, and weighed. Weights were normalized by length of colon. D, AOM/DSS-treated and untreated Nlrp6−/− and wildtype mice (N=5 mice/group) were given FITC-dextran by oral gavage on day 10. Serum was collected 4 hours later, and fluorescence measured by a fluorescent spectrophotometer. Data are expressed as means +/− S.E.M, *, p< 0.05 using Student’s t-test.