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Interactions of Ile50 with neighboring residues of PR20. (A) The closed conformation observed in PR20 in complex with inhibitor GRL02031 (4J55). The protein is shown with gray carbons. (B) The tucked conformation flap of PR20D25Ntuck with green carbons. Water molecules are shown as red spheres. Hydrogen bonds are indicated by dashed lines and van der Waals contacts in dot-dash lines.
