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Nitrosyl complexes of Fe(II)ACCO. Upper trace, X-band EPR spectrum (low-field region) of Fe(II)ACCO⋅NO; lower trace, Fe(II)ACCO⋅ACC⋅NO (10 mM ACC). (Inset) Fraction of substrate-bound enzyme plotted versus [ACC]free. Conditions: T = 8 K; frequency, 9.23 GHz; power, 0.160 mW; modulation frequency, 100 kHz.
