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Structural view of the FAD re face of the F9 mutant, showing the electron density of the oxygen molecule (cyan mesh) as well as the remaining positive electron density (green). Aligned to the His516 side chain of F9 (colored by atom type), one can see the side chains of A. niger wild-type structures 3QVP (orange) and 1CF3 (magenta). Also shown are the oxygen atoms of the corresponding water molecules that are equivalent to HOH1000 in F9.
