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(a) Normalized V2C XES spectra of isolated FeMoco (red) and a representative fit to the data (black dotted line). (b) Comparison of the normalized V2C XES data for FeMoco (red), the MoFe protein (gray), and the ∆nifB MoFe protein (black). Inset: V2C satellite region for Fe2O3 (red), Fe3N (blue), and MoFe protein (gray).
