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. 2016 Nov 29;7:13445. doi: 10.1038/ncomms13445

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Copyright © 2016, The Author(s)

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(a,b) Compounds I (shown in red) in CcP (ref. ¹⁸) and in both P450 and APO (refs ²², ²³) are Fe(V)=O species. (c) In P450 and APO, there is a large increase in pK_a of the ferryl group going from Compound I to Compound II (the latter shown in blue), and the ferryl group is a protonated Fe(IV)–OH (refs ²¹, ²⁴). (d) Compound II of APX is an Fe(IV)–OH species, as presented in this paper. Bond lengths for CcP-I are from ref. 17 and for P450-I and P450-II are from refs ²¹, ²⁶.