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Electron density at position 39 for WT (A), oxWT (B), C39A (C), and C39D Rv (D). The Fourier map (cyan) is shown at 1 σ cutoff for all the atoms. The omit map (red) is shown at 3 σ cutoff for the O atom of sulfenic acid (B) and the side chain of Asp-39 (D).
