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. 2006 Aug 8;103(33):12307–12310. doi: 10.1073/pnas.0603159103

Fig. 3.

Fig. 3.

Cryoreduction of CPO-II. A sample of CPO-II containing 20% glycerol was γ-irradiated at 77 K, resulting in reduction of the EPR-silent Fe(IV)OH center. The Fe(III)OH species generated by this process is EPR active, and ENDOR measurements revealed a very strongly coupled (13.4 MHz) exchangeable proton.