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Active site of SpUP. (a) Electron density for uracil and R1P. The NCS-averaged Fo-Fc density was calculated with phases from the refined model after the ligands were removed. The map is contoured at 3.0 σ. (b) Stereo diagram of the active site containing R1P and Ura. The red spheres represent water molecules. Hydrogen bonds are indicated by dashed lines.
