Enzymes that act at a free C-terminus of a polypeptide to liberate a single amino acid residue. They are further divided based on their catalytic mechanism into serine-type carboxypeptidases EC 3.4.16; metallocarboxypeptidases, EC 3.4.17; and cysteine-type carboxypeptidases, EC 3.4.18. EC 3.4.-.
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