MA1-950 detects human and mouse Bcl-3 from transfected cells and shows no cross-reactivity to other Bcl isoforms. MA1-950 has been successfully used in Western blot procedures. By Western blot, this antibody detects an ~47 kDa protein representing Bcl-3 from C57BI/6 human T cells and Bcl-3 transgenic ms T cells. MA1-950 immunogen is full length Bcl-3 protein from mouse.B cell Lymphoma 3 is a member of the IkB subfamily of inhibitors. This subfamily is part of the NF-kB transcription factor protein family and it is suggested that a balance in the concentration of various NF-kB family members regulates apoptosis and survival of activated T cells. Bcl-3 has been shown to have versatile functions such as cytoplasmic activation of p50 homodimers, translocation to the nucleus, and modulation of the transcriptional machinery in the nucleus. Bcl-3 activity often relies on several nuclear interacting proteins such as Tip60, Jab1, Bard1, and Pirin.