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Signal transduction by interleukin-12 (IL-12) requires phosphorylation and activation of STAT4. Direct interaction of the SH2 domain of STAT4 with a phosphotyrosine residue in the IL-12 receptor has been proposed to be required for the subsequent STAT4 phosphorylation. The IL-12 receptor β2 subunit contains three tyrosine residues in its cytoplasmic domain. To test the hypothesis that one of these...
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