(A) Representative images of H&E, BrdU, cleaved caspase-3, and survivin staining of control and anti-CD3 mAb-treated WT and Tnf−/− colon at 24 hours. (B) Quantification of BrdU-, cleaved caspase-3- and survivin-positive IEC detected per crypt. Positive cells were counted in at least 20 well-oriented crypts per section; n=6–8 mice per group. Values represent mean ± SEM, *p<0.05.