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X-band parallel-mode EPR spectra from a series of complexes with increasing spin. (A) [MnVH3buea(O)], S=1 (Taguchi et al., 2012); (B) Fe2+ heme of myoglobin, S=2 (Hendrich & Debrunner, 1989); (C) P-cluster of nitrogenase, S=3 (Surerus et al., 1992); (D) (Fe2+)2 center of methane monooxygenase, S=4 (Hendrich, Munck, Fox, & Lipscomb, 1990). Temperatures, 2–11 K; microwave frequencies, 9.1–9.3 GHz.
