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. 2022 Jan 13;12:694. doi: 10.1038/s41598-021-04714-6

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Electron density map of room-temperature glucose isomerase embedded in beef tallow. (A) 2 mFo-DFc electron density map (grey mesh, 1.2σ) of glucose isomerase. (B) 2mFo-DFc (grey mesh, 1.2σ) and mFo-DFc (green, 3σ; red, − 3σ) electron density map of metal binding sites at the active site of glucose isomerase.