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Structures of the diiron center. (A) Native PH diiron center without PHM bound. (B) Native PH diiron center with PHM bound. (C) Mixed-valent MMOH diiron center. (D) SeMet PH diiron center without PHM bound. (E) SeMet PH diiron center with PHM bound. Carbon, nitrogen, oxygen, and iron atoms are colored gray, blue, red, and orange, respectively. This color scheme will be used throughout unless otherwise noted.
