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Electron-density map (blue, 2m|F obs| − D|F calc|, 1.0σ; green, m|F obs| − D|F calc|, 3.0σ; red, m|F obs| − D|F calc|, −3.0σ) calculated from phases directly after the masked electron densities shown in Fig. 3 ▶(c) were used as a model for molecular replacement in the 3.0 Å resolution data set (Table 2 ▶). The WbdD model (yellow) and the SAM cofactor (white) are shown as sticks.
