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Location of the BCPs as respect to the atomic positions of the truncated models of IscU_wt and its mutants assuming deprotonated cysteines. Top two panels: His105 of IscU_wt is assumed uncharged (left) and charged (right); Middle panels: the same for IscU_D39A. Lower panel left: IscU_H105A. Lower panel right: IscU_D39A_H105A. BCPs are shown as small red spheres. Zn, S, O, C, H, and N atoms are shown as white, yellow, red, black, gray, and blue spheres, respectively.
