(A) Schematic protocol for AOM/DSS-induced colorectal tumorigenesis. At 8 weeks of age, AhrΔ2/Δ2 (n=20) and WT mice (n=37) were treated with a single dose of 10 mg/kg body weight of AOM by IP injection. Seven days after the AOM injection, the mice were given 1% DSS by drinking water for 5 days. Sixteen weeks later, the mice were sacrificed for evaluation of colorectal tumorigenesis. (B) Incidence of colorectal tumors in AOM/DSS-treated AhrΔ2/Δ2 and WT mice. (C-E) AOM/DSS-induced colorectal tumor multiplicity in AhrΔ2/Δ2 and WT mice. (C) Total colorectal tumor multiplicity. (D) Gender-based classification. (E) Segmentation-based classification. (F) Size of colorectal tumors in AOM/DSS treated AhrΔ2/Δ2 and WT mice. Bars represent mean values. a; significantly different relative to WT mice (p<0.05), b; significantly different relative to the proximal colon of WT mice (p<0.05), c; significantly different relative to the proximal colon of AhrΔ2/Δ2 (p<0.05).