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LT-beta-R, also known as lymphotoxin beta receptor and tumor necrosis factor receptor superfamily member 3 is a 47 kD transmembrane protein containing 3 TNF receptor domains. The LT-beta-R is a receptor for the heterotrimeric lymphotoxin complex (composed of LT alpha and LT beta as well as LIGHT. LT-beta-R is highly expressed in the lung, liver, and kidney and moderately expressed expressed in the heart and testes. LT-beta-R is weakly expressed in the brain, thymus, spleen, and lymph nodes. The cytoplasmic tail of LT-beta-R interacts with TRAF3, TRAF4, and TRAF5 as well as the hepatitis C virus core protein. Ligand binding to LT-beta-R has been shown to induce apoptosis (via TRAF3 and TRAF5) and play a role in the development of lymphoid organs.