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Active site region of MmADO viewed through the substrate tunnel. The Fe ion (orange sphere) is bound by His100, His102, His179 (purple), and three water molecules (red spheres). Other amino acids in the active site are highlighted in yellow (Phe89, Asp192, Cys206, and Tyr208) or green (Pro196, Pro197, and Tyr198). A stereo view of the active site is shown in the Supporting Information Fig. S3.
