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EPR spectra recorded on oriented multilayers of purified cytochrome bc1 complex from Rv. sulfidophilum with a magnetic field at 0° (continuous lines) and 90° (dashed lines) with respect to the plane of the membrane in the absence of inhibitor (a) or in the presence of stigmatellin (b). Instrument settings: temperature, 15 K; microwave frequency, 9.43 GHz; microwave power, 6.7 mW; modulation amplitude, 3.2 mT.
