Anti-proline/arginine-rich end leucine-rich repeat protein antibodies enable researchers to detect and measure the proline/arginine-rich end leucine-rich repeat protein antigen in biological samples. This target is a reported synonym of the PRELP gene, which encodes proline and arginine rich end leucine rich repeat protein. This protein is known to function in skeletal system development, among other biological roles. The human version of proline/arginine-rich end leucine-rich repeat protein has a canonical amino acid length of 382 residues and a protein mass of 43.8 kilodaltons. It is reported to be localized in the extracellular matrix and is secreted of cells. Other names for this target antigen include MST161, MSTP161, and SLRR2A.