Cell extracts were incubated overnight with immobilized p38 MAPK (Thr180/Tyr182) monoclonal antibody (mAb) (#9219 Cell Signaling Technology). A kinase reaction was performed in the presence of 100 µM of cold ATP (Cell Signaling Technology) and 2 µg of ATF2 fusion protein (#9224S Cell Signaling Technology). The phosphorylation of ATF2 at Thr71 was measured by western blotting using phospho-ATF2 (Thr71) antibody (#9221S Cell Signaling Technology).
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