The ORP4 ELISA kits listed below are analytical tools for measuring concentrations of ORP4 in various samples. ORP4 is an alternative name for the human OSBP2 gene, which encodes the protein, oxysterol binding protein 2. It has been mentioned that ORP4 plays a role in spermatid development, among other functions. Structurally, the OSBP2 protein is 916 amino acid residues in length and 101.3 kilodaltons in mass. However, as many as 6 protein isoforms have been identified. It is localized to the membrane of the cell. In terms of tissue specificity, it is notably expressed in retina, testis, and fetal liver. Other names for this target antigen include HLM, HLM, and ORP-4. Click on the following ELISA kits for more detailed information, including target reactivity and assay sensitivity.