Anti-QPD antibodies enable researchers to detect and measure the QPD antigen in biological samples. This target is a reported synonym of the PLAU gene, which encodes plasminogen activator, urokinase. This protein is known to function in chemotaxis and the regulation of cell migration, among other biological roles. The human version of QPD has a canonical amino acid length of 431 residues and a protein mass of 48.5 kilodaltons, although 2 isoforms have been identified. It is reported to be a secreted protein that is widely expressed in many tissue types. Other names for this target antigen include ATF and BDPLT5. ELISA is a widely used application for the QPD antibodies listed below. In addition, Western Blot is also a common application.