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. 2022 Apr 19;21:64. doi: 10.1186/s12934-022-01791-8

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Fig. 4 — Overall view on residues lining the active site of Copu9. Same color coding as in Fig. 3. The three Mg²⁺ ions are shown as green spheres and the AHD in stick representation. The cavity of the active site pocket is indicated as an inverted surface displayed in gray