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X-band EPR spectra of F. ignava NrdBΔ169 recorded at 5–15 K. Spectra were recorded on samples with 1.13 mm protein. Instrument settings were as follows: microwave frequency, 9.28 GHz; modulation amplitude, 10 G; modulation frequency, 100 kHz; microwave power, 1 milliwatt; and temperature, 5–15 K.
