γδ T cells activate DCs and enhance allogeneic responses. II^-/- B6 mice were depleted of γδ T cells, irradiated with 1100 cGy TBI, and injected on day -1 with 5 × 10⁶ B6 DCs that had been cocultured either with γδ T cells or with medium. Mice underwent transplantation with 5 × 10⁶ T cells from bm12 donors on day 0. Splenocytes and serum were harvested on day 5 after BMT (n = 4 per group), and donor CD4⁺ T cells were phenotyped by FACS. Data represent the mean + SE. (A) Donor CD4⁺ T cells. ▥ vs ▪, ^*P < .05. (B) TNF-α. □ vs ▪, ^*P < .05. ND indicates not detected.