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Reduction of the NTD redox-active disulfide center by syn-chrotron radiation. (A) The active site Cys-X-X-Cys of rNTD in its electron density based on the LAB data set, and (B) the equivalent image based on the SYNC data set. The electron density in both panels is contoured at 3.5 σ, and the Sγ–Sγ distances are given. The figure was generated by using Pymol (DeLano Scientific).
