Anti-GELB antibodies enable researchers to detect and measure the GELB antigen in biological samples. This target is a reported synonym of the MMP9 gene, which encodes matrix metallopeptidase 9. This protein is known to function in the apoptotic pathway and cell migration, among other biological roles. The human version of GELB has a canonical amino acid length of 707 residues and a protein mass of 78.5 kilodaltons. It is reported to be localized in the extracellular matrix and is secreted of cells and notably expressed in many tissues, such as the bone marrow and kidney. Other names for this target antigen include CLG4B and MANDP2. Some GELB antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. ELISA and Immunohistochemistry are also common applications.