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SP600125 is a selective, reversible ATP competitive inhibitor of c-Jun N-terminal kinase (JNK). It exhibits greater than 300-fold selectivity for JNK against related MAP kinases ERK1 and p38-2, and the serine threonine kinase PKA. In cells, SP600125 causes dose-dependent inhibition of the phosphorylation of c-Jun, the expression of inflammatory genes IL-2, COX-2, TNF-α, IFN-γ, and blocks the activation and differentiation of primary human CD4 cell cultures.