2JPT:
reference: Structural and motional changes induced in apo-S100A1 protein by the disulfide formation between its Cys 85 residue and beta-mercaptoethanol., Zhukov I, Ejchart A, Bierzynski A, Biochemistry. 2008 Jan 15;47(2):640-50. Epub 2007 Dec 19. PMID: 18088104

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