Anti-ETL antibodies enable researchers to detect and measure the ETL antigen in biological samples. This target is a reported synonym of the ADGRL4 gene, which encodes adhesion G protein-coupled receptor L4. This protein is known to function in GPCR signaling pathways and receptor-mediated signaling pathways, among other biological roles. The human version of ETL has a canonical amino acid length of 690 residues and a protein mass of 77.8 kilodaltons. It is reported to be localized in the cell membrane of cells and notably expressed in the smooth muscle, kidney, gallbladder, and breast. ETL is a member of the G-protein coupled receptor 2 protein family.