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Coordination of cobalt ions involved in protein crystal contacts. (a) Co1, which is situated on the crystal threefold axis and mediates contacts with Asp326 in the N-terminal domains of three adjacent FPGS molecules. (b) Co2, which is coordinated between the C-terminal domains of two adjacent protein molecules. Cobalt ions (Co) are represented as dark blue spheres and water molecules are represented as red spheres.
