1AI8:
reference: The refined 1.9-A X-ray crystal structure of D-Phe-Pro-Arg chloromethylketone-inhibited human alpha-thrombin: structure analysis, overall structure, electrostatic properties, detailed active-site geometry, and structure-function relationships., Bode W, Turk D, Karshikov A, Protein Sci 1992 Apr;1(4):426-71. PMID: 1304349

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