NF-kappaB p50/p65 complex A heterodimer of NF-kappa B p50 and p65 subunits. GO:0035525 Note that the p50 subunit is encoded by NFKB1 gene in human and the p65 subunit is encoded by the RELA gene in human. Similar nomenclature is used in other vertebrate species. The p50 subunit has a precursor form p105 in some publications. protein nuclear protein-containing complex