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Apparent pseudo-first-order rate constants for association of cyanide with (○) wild-type ferric S6803 rHb-R, (□) A69S ferric S6803 rHb-R, (●) wild-type ferric S6803 rHb-A, and (■) A69S ferric S6803 rHb-A. The protein concentrations were 10.7 to 10.8 μM and the rate constants are for the major kinetic phase. The slopes of the solid lines represent apparent bimolecular rate constants.
