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10 K X-band EPR spectra of AcsAB (batch 2, 6.8 mg/ml). (A) Partially oxidized with thionin, 0.05 mW microwave power; (B) same as A, but at 20 mW microwave power. Other spectrometer conditions: microwave frequency, 9.42 GHz; modulation frequency, 100 kHz; modulation amplitude, 11.8 G; sweep time, 164 s; time constant, 328 s.
