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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(A) DPP-4 enzyme sites (B) Structure of DPP-4 homodimer, the structure is prepared by using Pymol (C) illustrates subsites in the protein structure (PDBID:1X70) in CPK representation form.