3HW7:
reference: Flexibility of the Cu,Zn superoxide dismutase structure investigated at 0.57 GPa., Ascone I, Savino C, Kahn R, Fourme R, Acta Crystallogr D Biol Crystallogr. 2010 Jun;66(Pt 6):654-63. Epub 2010 May 15. PMID: 20516618

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