| 2H4W: reference: An allosteric circuit in caspase-1., Datta D, Scheer JM, Romanowski MJ, Wells JA, J Mol Biol. 2008 Sep 19;381(5):1157-67. Epub 2008 Jun 20. PMID: 18590738 |
This OCA 
Structure page
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(documentation).