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Crystal structure of human dipeptidyl peptidase 4 (DPP4) and bovine adenosine deaminase (ADA) obtained from Protein Data Bank: 1W1I. (a) DPP4 crystal structure associated with bovine ADA at its glycosylation‐rich region of the propeller domain. (b) Top view of propeller domain, showing ADA binding site at bladea 4 and 5 as well as ADA interactions with carbohydrates of N229. (c) Caveolin‐1 binding site at aa 201–210 and Ser630 7.
