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CD corner interactions in the crystal unit cell. The CD corner (indicated by X) is surrounded by three symmetry-related protein molecules (marked by A, B, and C) whose positions correspond to as many symmetry transformations (see text). The protein “A” interacts with the CD corner through the helices G and H and the BC loop, the protein “B” through the CD loop, and the protein “C” through the helices B and G.
