3QYD:
reference: Role of remote scaffolding residues in the inhibitory loop pre-organization, flexibility, rigidification and enzyme inhibition of serine protease inhibitors., Majumder S, Khamrui S, Dasgupta J, Dattagupta JK, Sen U, Biochim Biophys Acta. 2012 Jul;1824(7):882-90. doi: 10.1016/j.bbapap.2012.04.009., Epub 2012 May 1. PMID: 22709512

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