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Ub Ub Ub Ub Ub TNFa receptor cytoplasm adaptor proteins IKK kinase complex a b IKK complex NEMO IkB NF-kB 26S proteasome Phosphorylation of IkB Ubiquitination and degradation of IkB NF-kB ubiquitin Ub nucleus Gene expression phospho-serine Figure 3