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(a) Cartoon representation of the crystal structure of Bh-MutT with the 23-residue Nudix box highlighted in wheat. The side chains of the residues that form the Nudix box are shown (O, red; N, blue) along with the Mg2+ ion (black sphere). (b) The electron density surrounding the Mg2+ ion in the crystal structure of Bh-MutT illustrated at 1.2σ. The O atoms from the side chains of Glu61 and Glu57 are coordinated to the ion.
