Ready-to-use ELISA kits are available for the detection of Angiostatin, an alias of the protein, plasminogen. The official gene symbol is PLG. The kits can detect several species variants of the protein, including: human, mouse, rat, bovine, primate, and other mammalian. The protein, with a mass of 90.6 kDa and length of 810 residues, is reported to be secreted. It is a member of the Peptidase S1 family, Plasminogen subfamily and may be known by other names, including: plasmin.