Anti-PRELP antibodies are used in the immunodetection of the protein proline and arginine rich end leucine rich repeat protein. In humans, the canonical protein has a reported length of 382 amino acid residues and a mass of 43.8 kDa. Its subcellular localization is in the extracellular matrix and is also secreted. A member of a the Small leucine-rich proteoglycan (SLRP) protein family, PRELP is believed to anchor basement membranes to the underlying connective tissue. Post-translational modifications have been described, including glycosylation. Synonyms for this target antigen include MSTP161, SLRR2A, prolargin, 55 kDa leucine-rich repeat protein of articular cartilage, prolargin proteoglycan, and MST161.