The function of CPA4 (carboxypeptidase A4, Ensembl gene identifier ENSG00000128510) is as follows. Metalloprotease that cleaves hydrophobic C-terminal residues with a preference for -Phe, -Leu, -Ile, -Met, -Tyr and -Val (PubMed:20385563). May function in peptide hormone and/or neuropeptide catabolism (PubMed:20385563). .