Housekeeping prolyl oligopeptidase (POP) that behaves like a conventional POP by cleaving peptide bonds on the C-terminal side of prolyl residues within peptides that are up to approximately 30 amino acids long (PubMed:22202811). Hydrolysis of Pro-|-Xaa >> Ala-|-Xaa in oligopeptides. Monomer. Belongs to the peptidase S9A family.