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The coordination of Fe3+ and two CO3 2− ions in MsTsf1. (a) The site of Fe3+ coordination. The ligating tyrosines, Tyr90 and Tyr204, and two CO3 2− ions are in cyan, and the Fe3+ is shown as a brown sphere. The blue anomalous difference map and yellow Fo‐Fc are contoured at 3.0 σ and the grey 2Fo‐Fc map is contoured at 1.0 σ. (b) Hydrogen bond interactions (dashed lines) between MsTsf1 residues (cyan) and the CO3 2− ions (grey)
