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EPR spectra of PSII poised at different potentials from an equilibrium redox titration done in the dark. (A) Radical region spectra showing the QB•−Fe2+ at g = 2.0024 (microwave power, 205.1 mW; modulation amplitude, 10.53 G). (B) Wider scan of the same samples after 77-K illumination showing the QA•−Fe2+QB•− signal at g = 1.66 (microwave power, 20 mW; modulation amplitude, 25.35 G).
