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. 2011 Nov 9;6(11):e27124. doi: 10.1371/journal.pone.0027124

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Tondo et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) UV-visible spectra displayed by the different plant-type FNRs. (B) Near-UV and visible CD spectra of the enzymes. (C) FAD solvent accessibility studied by quenching with KI. Xac-FNR (○), pea-FNR (▪), Ec-FNR (•), free FAD (▴). (D) Differential UV-visible spectra elicited by the interaction between the enzymes and NADP⁺. The spectra were obtained by the subtraction of the spectra of FNR in the presence of 0.3 mM NADP⁺ and the free enzyme. Different colors were employed for each FNR variant: cyan, Xac-FNR; green, pea-FNR; and red, Ec-FNR.