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. 2016 Mar 14;7:10902. doi: 10.1038/ncomms10902

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In the PN state of P-cluster, all irons are in the Fe(II) state and were averaged as an internal reference for ferrous iron (black). Individual SpReAD profiles for the seven iron atoms of FeMoco (shown in ball-and-stick representation) align with this standard for Fe1, Fe3 and Fe7, whereas the remaining Fe2, Fe4, Fe5 and Fe6 were shifted to higher energies, indicating a more oxidized state.