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Diffraction images for crystals of mutant D4. (a) An X-ray diffraction image for the Δ171-172D4 crystal. The edge of the detector corresponds to a resolution of 2.05 Å. (b) An X-ray diffraction image for R167AD4. The edge of the detector corresponds to a resolution of 1.59 Å. (c) An X-ray diffraction image for 3GD4. The edge of the detector corresponds to a resolution of 1.99 Å.
