Description: The DJR3 monoclonal antibody reacts with human Decoy receptor 1 (DcR1), a glycophospholipid-anchored cell surface protein also known as TRAIL-R3, TRID, and LIT. DcR1 has an extracellular TRAIL binding domain and lacks the cytoplasmic death domain (DD) shared by several members of the TNF receptor superfamily. DcR1, along with DcR2, protects cells from TRAIL-mediated cytotoxicity. DcR1 binds to TRAIL and inhibits binding of TRAIL to DR4 or DR5. DcR1 is expressed broadly in many normal tissues at low level, but not in most tumors. Overexpression of DcR1 attenuates TRAIL-induced apoptosis.