Description: The LH1 monoclonal antibody reacts with mouse Herpes Virus Entry Mediator (HVEM, TR2), a member of the TNF-receptor superfamily. HVEM is found on most cell types, including T cells, B cells, monocytes, neutrophils and dendritic cells. This receptor was identified as a cellular mediator of herpes simplex virus (HSV) entry. Binding of HSV viral envelope glycoprotein D (gD) to this receptor protein has been shown to be part of the viral entry mechanism. The cytoplasmic region of HVEM was found to bind to several TRAF family members, which may mediate the signal transduction pathways that activate the immune response. HVEM has also been demonstrated to be a unique ligand for BTLA (B and T lymphocyte attenuator). The conservation of the BTLA-HVEM interaction between mouse and human suggests that this system is an important pathway regulating lymphocyte activation and/or homeostasis in the immune response. The LH1 antibody has been reported as a blocking antibody, interfering with the HVEM-LIGHT interaction but not the HVEM-BTLA interaction.