tokens: The virally induced 90- to 100-kDa proteins have a distinct binding specificity for the PRDII domain and an AT-rich sequence but do not cross-react with NF-kappa B subunit-specific antisera directed against NFKB1 ( p105 or p50 ) , NFKB2 ( p100 or p52 ) , RelA ( p65 ) , or c-rel .