Fig. 6.

Dependence of the reaction rate constants versus the pH for the neuroglobin mutants. The main panels show the logarithm of the reaction rate constants versus the pH; the insets show the reaction rate constants versus the pH. The linear fit of the logarithm of the rate constants is denoted by a solid red line. In the case of the F42Y mutant, red lines indicate the fit of the slow phase, and blue lines denote the fit of the fast phase rate constants. The slope of the linear fit is indicated in each panel.