2J8J:
reference: Solution structure of the A4 domain of factor XI sheds light on the mechanism of zymogen activation., Samuel D, Cheng H, Riley PW, Canutescu AA, Nagaswami C, Weisel JW, Bu Z, Walsh PN, Roder H, Proc Natl Acad Sci U S A. 2007 Sep 20;. PMID: 17884987

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