4BFQ:
reference: Assembly of a pi-pi stack of ligands in the binding site of an acetylcholine-binding protein., Stornaiuolo M, De Kloe GE, Rucktooa P, Fish A, van Elk R, Edink ES, Bertrand D, Smit AB, de Esch IJ, Sixma TK, Nat Commun. 2013;4:1875. doi: 10.1038/ncomms2900. PMID: 23695669

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