Anti-COL9A2 antibodies are used in the immunodetection of the protein collagen type IX alpha 2 chain. In humans, the canonical protein has a reported length of 689 amino acid residues and a mass of 65.1 kDa. Its subcellular localization is in the extracellular matrix and is secreted. It is notably expressed in the kidney, eye, and cartilage. A member of the Fibril-associated collagens with interrupted helices (FACIT) protein family, COL9A2 is reported to be a structural component of hyaline cartilage and vitreous of the eye. Post-translational modifications have been described, including glycosylation. Synonyms for this target antigen include EDM2, MED, STL5, collagen alpha-2(IX) chain, alpha 2 type IX collagen, and DJ39G22.4. COL9A2 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. Some COL9A2 antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. In addition, ELISA is also a common application.