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. Author manuscript; available in PMC: 2008 Aug 7.
Published in final edited form as: J Am Chem Soc. 2006 Jun 14;128(23):7458–7459. doi: 10.1021/ja062762l

Figure 1.

Figure 1

EPR spectra of the diiron(III,IV)-W• intermediate generated in the reaction of reduced ToMOH-I100W with O2. The reaction was quenched at 4 s using natural-abundant diiron(II) protein (blue) or at 3.5 s using 57Fe-enriched protein (red).