1ATU:
reference: The native strains in the hydrophobic core and flexible reactive loop of a serine protease inhibitor: crystal structure of an uncleaved alpha1-antitrypsin at 2.7 A., Ryu SE, Choi HJ, Kwon KS, Lee KN, Yu MH, Structure 1996 Oct 15;4(10):1181-92. PMID: 8939743

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