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I cAMP I R-SMAD c-jun R-SMAD Smad4 p300 /CBP p300 /CBP p300 /CBP Phospho-Serine Phospho-Threonine TGF-b IFN-g TNF-a TGF-b PGE2 IFN-g II II cytoplasm SMAD7 FKBP12 JNK SARA JAK1 R-SMAD Smad4 Smurf1/2 PKA R-SMAD Smad4 CREB STAT1a Ski/SnoN SNIP nucleus R-SMAD Smad4 Gene expression Figure 1