2IZQ:
reference: Nonstoichiometric complex of gramicidin D with KI at 0.80 A resolution., Olczak A, Glowka ML, Szczesio M, Bojarska J, Duax WL, Burkhart BM, Wawrzak Z, Acta Crystallogr D Biol Crystallogr. 2007 Mar;63(Pt 3):319-27. Epub 2007, Feb 21. PMID: 17327669

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