Weight loss (Fig. 4d), colon weight/colon length ratio (Fig. 4e), spleen weight (Fig. 4f) and colonic MPO activity (Fig. 4g), was not statistically different between DSS-treated WT and PepT1−/− mice, suggesting that physical separation at weaning was not sufficient to affect the host susceptibility to colitis. Here, MPO is linked to colitis.