selective cell-specific effects. We show that deficiency of Socs3 in T cells had minimal effects
on differentiation of T cells to the T helper (Th) 1 or Th2 subsets; accordingly, Socs3 had no
effect on IL-12-dependent signal transducer and activator of transcription (Stat) 4
phosphorylation or IL-4-dependent Stat6 phosphorylation. By contrast, Socs3 was found to
be a major regulator of IL-23-mediated Stat3 phosphorylation and Th17 generation, and …