Chemokine receptor expression on OT-II cells entering the intestinal LP. Representative chemokine receptor staining on WT and CCR9^–/– OT-II cells in the intestinal LP 3 days after intraperitoneal administration of OVA plus LPS. Numbers represent the mean (SEM) chemokine receptor-positive OT-II cells from 4 to 6 experiments except for CCR8 (3 experiments). *P < .03, **P < .001, paired 2-tailed Student t test for differences between WT and CCR9^–/– OT-II cells.