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Medical Definition of Nf-kappa b
1. Ubiquitous, inducible, nuclear transcriptional activator that binds to enhancer elements in lymphoid cells. In B-lymphocytes nf-kappa b binds to the immunoglobulin kappa light chain enhancer and in T-lymphocytes it has been shown to bind to the enhancers in virally infected cells including HIV. (12 Dec 1998)