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Crystals of the AAA+ ATPase domain of the NtrC1 activator grown in the presence of ADP–BeFx–Mg. (a) Representative example of NtrC1 crystals grown in the presence of the ATP analog and ethylene glycol. (b) Example of the darkening observed upon exposure of some of the NtrC1 crystals to the X-ray beam. Arrows show the tracks of several exposures at different regions of the crystal cooled in a 0.4 mm loop.
