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A, two dscCfaE G168D molecules (yellow and red) are present in one asymmetric unit in the crystal structure. The donor strands are highlighted in cyan. B, superposition of chain A from both the dscCfaE (blue) and dscCfaE G168D (yellow) structures. The side chains of three arginines (Arg-67, Arg-181, and Arg-182) are shown in ball and stick.
