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(A) EPR spectra of TNN14-H and TNN15-H denoting the spectral ratios Iin and Iout in the presence of 10%O2-90%N2. Spectra were recorded with 0.5 mW microwave power and 0.03 G modulation amplitude. (B) Plot of Iin/Iout as a function of percent oxygen. The trityl-hydroxylamines were generated by mixing ascorbate (4 mM) with the corresponding biradical (50 μM).
