The HAPO ELISA kits listed below are analytical tools for measuring concentrations of HAPO in various samples. HAPO is an alternative name for the human PRG4 gene, which encodes the protein, proteoglycan 4. It has been mentioned that HAPO plays a role in immune response pathways, among other functions. Structurally, the PRG4 protein is 1404 amino acid residues in length and 151.1 kilodaltons in mass. However, as many as 6 protein isoforms have been identified. It is known to be a secreted protein. In terms of tissue specificity, it is reported to be highly expressed in synovial tissue, cartilage and liver and weakly in heart and lung. This protein is known to be O-glycosylated, N-glycosylated and cleaved. Other names for this target antigen include CACP and JCAP. Click on the following ELISA kits for more detailed information, including target reactivity and assay sensitivity.