Description: The monoclonal antibody 9ACT12 reacts with human Act1 (NF-κB activator 1), also known as CIKS (a connection to IkB kinase and stress-activated kinase). Originally cloned for its ability to activate NF-κB and its direct interaction with IKKγ, Act1 has been subsequently shown to play several roles in immunity. In B cells, it is a negative regulator of CD40 and BAFFR signaling affecting reduced survival. This regulation is through direct interaction of Act1 with CD40 or BAFFR and TRAF3. In addition, Act1 is involved in IL-17R signaling. It interacts with IL-17RA through the homotypic SEFIR interaction domain and is critical for downstream NF-κB- and C/EBP-mediated inflammatory responses.