Defective induction of selectin ligands in T-bet^-/- Th1 cells. Purified CD4⁺ T cells were cultured under either Th1 (IL-2 plus IL-12 plus anti–IL-4) or Th0 (IL-2 only) conditions and analyzed on day 8 for rolling on (A) E-selectin and (B) P-selectin. One representative of at least 2 experiments. ^**Significantly different (P < .05) from all other groups; ^*significantly different (P < .05).