2K2I:
reference: Structure, dynamics and thermodynamics of the human centrin 2/hSfi1 complex., Martinez-Sanz J, Kateb F, Assairi L, Blouquit Y, Bodenhausen G, Abergel D, Mouawad L, Craescu CT, J Mol Biol. 2010 Jan 8;395(1):191-204. Epub 2009 Oct 24. PMID: 19857500

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