CD4+CD25+ depletion of CD80-stimulated splenocytes restores the ability to cause diabetes. A, Splenocytes from 6-wk-old NOD mice were adoptively transferred into NOD.scid-RIP-CD80 and NOD.scid-RIP-CD86 mice. When the mice became diabetic, the splenocytes were harvested and stained for CD4+CD25+ and FoxP3+ cells. Top panels, Representative cells from NOD.scid-RIP-CD80 mice; lower panels, cells from NOD.scid-RIP-CD86 mice. B, The splenocytes were depleted of CD4+CD25+ T cells (>80% depleted) and then adoptively transferred to NOD.scid mice which were observed for diabetes. These were compared with cells that had not been depleted of CD4+CD25+ cells. The results shown for the transfer from diabetic NOD.scid-RIP-CD80 mice are combined from two separate experiments.