different between polypeptide vs exopeptidase

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poly- +? peptide

polypeptide (plural polypeptides)

(organic chemistry) Any polymer of (same or different) amino acids joined via peptide bonds.
(biochemistry) Any such polymer that is not folded into a secondary structure of a protein.
(biochemistry) A small protein containing up to 100 amino acids; see also oligopeptide.

exo- +? peptide +? -ase

exopeptidase (plural exopeptidases)

(biochemistry) Any of a group of enzymes which catalyze the removal of a single amino acid from the end of a polypeptide chain

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