3E76:
reference: Use of thallium to identify monovalent cation binding sites in GroEL., Kiser PD, Lorimer GH, Palczewski K, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2009 Oct 1;65(Pt, 10):967-71. Epub 2009 Sep 18. PMID: 19851000

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