3UQ4:
reference: Mutations that stabilize the open state of the Erwinia chrisanthemi ligand-gated ion channel fail to change the conformation of the pore domain in crystals., Gonzalez-Gutierrez G, Lukk T, Agarwal V, Papke D, Nair SK, Grosman C, Proc Natl Acad Sci U S A. 2012 Apr 2. PMID: 22474383

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