Anti-proline rich 15 like antibodies are used in the immunodetection of the protein encoded by the PRR15L gene. In humans, the canonical protein has a reported length of 103 amino acid residues and a mass of 11.7 kDa. The proline rich 15 like protein is a member of the PRR15 protein family. Other names for this target antigen include ATPase family, AAA domain containing 4, testicular tissue protein Li 157, and proline-rich protein 15-like protein.