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The iron VDOS of oxidized FeIII-FeBMb1(FeIII), shown in the upper trace, strongly resembles that reported80 for native Mb from sperm whale, indicating that coordination of the heme iron is unaffected by the presence of the additional nonheme iron engineered in the distal pocket. In spite of the limited signal, the nonheme iron VDOS in 57FeIII-FeBMb1(FeIII) (lower trace) clearly reports vibrations from a distinct iron site characterized by a reduced coordination strength.
