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TAB1, TAK1 binding protein, enhances activity of the plasminogen activator inhibitor 1 gene promoter, which is regulated by TGF-beta, and increases the kinase activity of TAK1. TAB1 may function as an activator of the TAK1 MAPKKK in TGF-beta signal transduction (1). Findings suggest that alternative activation pathways contribute to the biological responses of p38alpha to various stimuli. Interaction of p38alpha with TAB1 leads to autophosphorylation and activation of p38alpha (2).