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An in silico model for the structure of Synechococcus sp. PCC 7942 nitrate reductase showing the full model (left) and the cofactors and selected residues (right). The four residues targeted for mutagenesis are identified by their amino acid sequence numbers. The four side chains and cofactors are colored according to atom type. The right-hand figure is rotated by 90° about the x axis relative to the left-hand figure.
