Enforced BATF expression restores the gut-homing receptor deficiency of BATF KO T cells. (A) Retroviral vectors expressing the full-length and truncated versions of BATF were constructed. BATF-deficient T cells were infected by retroviral vectors expressing the full-length or truncated BATF genes. (B and C) Expression of CCR9 and α4β7 was determined by flow cytometry 4 d after infection, and the data are shown as dot plots (B) and graphs (C). The graphs show combined data from three experiments. All error bars are SEM obtained from pooled data. Significant differences from the control groups are shown (*, P < 0.05).