LIGHT belongs to the TNF family of ligands, and can signal through the herpes virus entry mediator type A receptor (HVEM, TNFRSF14), LTbetaR, or bind to a decoy receptor, DcR3. It is expressed in splenocytes, activated PBL, CD8+ tumor infiltrating lymphocytes, granulocytes, and monocytes. LIGHT has the ability to activate NF-kappaB, to co-stimulate the activation of lymphocytes and to induce apoptosis in certain human tumor cells. Recombinant Murine LIGHT is a 20.1 kDa protein containing 183 amino acid residues, comprising the TNF-homologous region of the LIGHT extracellular domain.