Seventeen years after its initial description, nuclear factor-KB (NF-KB) endures as one of the most studied transcription factors. NF-KB has attracted widespread interest based on the variety of stimuli that activate it, the diverse genes and bio logical responses that it controls, the striking evolutionary conservation of struc ture and function among species, and its involvement in a variety of human diseases. The biochemical basis by which several stimuli converge to activate NF-KB has been largely elucidated during recent years. While first discovered as a key regulatory factor of the...