4R7C:
reference: A structural, functional, and computational analysis suggests pore flexibility as the base for the poor selectivity of CNG channels., Napolitano LM, Bisha I, De March M, Marchesi A, Arcangeletti M, Demitri N, Mazzolini M, Rodriguez A, Magistrato A, Onesti S, Laio A, Torre V, Proc Natl Acad Sci U S A. 2015 Jun 22. pii: 201503334. PMID: 26100907

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