The function of CTSZ (cathepsin Z, Ensembl gene identifier ENSG00000101160) is as follows. Exhibits carboxy-monopeptidase as well as carboxy-dipeptidase activity (PubMed:10504234). Capable of producing kinin potentiating peptides (By similarity). {ECO:0000250|UniProtKB:Q9R1T3, ECO:0000269|PubMed:10504234}.