Antigen: human NF-kB (p65) amino acids 526-539 . Host: mouse, clone 112A1021 . Isotype: IgG1k . Cross-Reactivity: (+) human, mouse, and rat NF-kB (p65); expected to react with bovine, gorilla, monkey, and porcine NF-kB (p65) . Application(s): FC, IHC, and WB . The active nuclear form of the NF-kB transcription factor complex is composed of two DNA binding subunits, NF-kB p65 and p50. N-terminal regions of p50 and p65 are critical for DNA binding and help determine the DNA-binding specificities of p50 and p65.