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Top panel: Bimolecular kinetics for CO rebinding to rHbI and several Hb site-directed mutants. Samples of 10 µM heme-protein were monitored at 436 nm. The conditions for all reactions were 50 mM sodium phosphate at pH 7.4, 25°C under air or 1atm (1000 µM) CO. Lower panel: Bimolecular kinetics for O2 recombination after photolysis of rHbI and the distal GlnE7His, PheB10Tyr and PheE7Asn mutants, for samples under air.
