Carboxypeptidase A1 (CPA1) is an enzyme responsible for catalyzing the release of a C-terminal amino acid; however, it exhibits limited or no activity with residues such as -Asp, -Glu, -Arg, -Lys, or -Pro. This specificity in substrate recognition underscores its role as a carboxypeptidase with selectivity towards certain amino acid sequences at the C-terminus of peptides. Carboxypeptidase A1/CPA1 Protein, Mouse (HEK293, His) is the recombinant mouse-derived Carboxypeptidase A1/CPA1 protein, expressed by HEK293 , with C-His labeled tag.