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Perpendicular (A and C) and parallel (B and D) mode X-band EPR spectra of purified cyt cm552 (A and B), and N. europaea membrane (C and D) and purified cyt cm552 (C and D). Experimental conditions: microwave frequency, 9.6 GHz (B1 ⊥ B) or 9.3 GHz (B1 ∥ B); temperature, 12 K (B1 ⊥ B) or 2 K (B1 ∥ B); microwave power (A) 2 mW, (B and C) 0.2 mW, or (D) 0.02 mW.
