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Catalytically inactive p38α does not down-regulate MKK6 protein levels in p38α−/− cells. Wild-type (wt), p38α-deficient cells and the p38α-deficient cells infected with either the retroviral vector or retroviruses expressing wild-type p38α or the kinase-dead mutant D168A were UV treated or left untreated, as indicated. The expression levels of p38α, MKK6, and tubulin in whole-cell extracts were determined by immunoblotting.
