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EPR spectra in the low-field region as recorded during a redox titration of the isolated b6f complex from C. reinhardtii (30 μM). EPR settings are as for Fig. 1. (A) Shown are results with no inhibitor; ambient redox potentials from top to bottom are: +362, +198, +18, −104, and −232 mV. (B) Shown are results in the presence of 66 μM NQNO at ambient redox potentials of (from top to bottom) +414, +200, +15, −61, −97, −217, and −337 mV.
