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Absorbance decay for the reaction of neuroglobin F42Y mutant at varying pH. Traces correspond to the reaction of F42Y (9 μM) with 10 mM nitrite (pH 6.2) 10 mM nitrite (pH 6.8) and 20 mM nitrite pH (8.0). Fit to a double exponential equation is denoted by red lines. Fit to a single exponential equation is indicated by blue lines.
