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IkB Kinase (IKK)

The classical active IKK complex, composed of IKK alpha, IKK beta, and two forms of processed IKK gamma, phosphorylates and inactivates IkB, resulting in the release and nuclear translocation of active NFkB. The regulatory IKK gamma is required for activation of the IKK complex. IKK epsilon is an IKK-related kinase with 30% structural homology to IKK alpha and beta, and is present in a subset of IKK complexes.