1AHT:
reference: Crystal structure of human alpha-thrombin complexed with hirugen and p-amidinophenylpyruvate at 1.6 A resolution., Chen Z, Li Y, Mulichak AM, Lewis SD, Shafer JA, Arch Biochem Biophys 1995 Sep 10;322(1):198-203. PMID: 7574675

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