Carboxypeptidase B2 preferentially releases the C-terminal amino acids Arg and Lys from biologically active peptides such as Kinins and Anaphylatoxins thus rendering them inactive.The synthetic peptide used to raise the antibody Cat. No. 200203 is selected from a sequence within the Central region of Carboxypeptidase B2. For blocking experiments, a 10 to 100 fold molar excess to antibody is recommended.