TWEAK receptor is also known as fibroblast growth factor inducible 14 kD protein (Fn14) or CD266. It is a 14 kD transmembrane protein that is expressed on a variety of tissue types. This receptor binds TWEAK and interacts with the cytoplasmic proteins TRAF1, 2, and 3. The TWEAK receptor is rapidly induced during liver regeneration and m play a role in hepatocyte growth. TWEAK receptor engagement can induce cell death and may play a role in inflammation. The ITEM-1 antibody is useful for flow cytometric analysis, induction of tumor cells apoptosis or necrotic cell death, enhancing endothelial cell proliferation, and immunohistochemistry on frozen tissues.