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elongatus. Field-dependent ELDOR-detected nuclear magnetic resonance resolves two classes of 55Mn nuclear spin transitions one class with small hyperfine couplings (|A| ≈ 1-7 MHz) and another with larger hyperfine couplings (|A| ≈ 100 MHz). These results are consistent with an all-MnIV4 open cubane structure of the S3 state and suggest that the broadened S3 signals arise from a perturbation of Mn4A and/or Mn3B, possibly induced by the presence of glycerol in the as-isolated Synechocystis PSII.Recent studies on 3,6-diphenylated imidazopy