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Composite OMIT maps of the binding site at His15 in chains A (a) and B (b) coordinating to fac-[Re(CO)3(H2O)2N] (the N atom is from His15). The 2F o − F c electron-density map contoured at 1.2 r.m.s. is shown in blue and the F o − F c electron-density map contoured at 5.0σ (the Coot default; Emsley & Cowtan, 2004 ▸) is shown in green; the anomalous electron-density map contoured at 3.0σ is shown in orange. This figure was prepared using CCP4mg (McNicholas et al., 2011 ▸).
