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The AcnR fold. A, stereo view of the AcnR protomer color-ramped from red to dark blue. B, the AcnR dimer in Form I generated by the crystallographic 2-fold symmetry axis, colored by chain. In B, the citrate-Mg2+ is shown with a space-filling representation. Figs. 2–5 were created using CCP4mg (62).
