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Fig. 4. Arrhenius activation energies (Ea) of M. trossulus,
M. galloprovincialis and M. californianus cMDHs, as well as rWT
M. trossulus cMDH, mutants V114H and V114N. Vmax
values were standardized to 1.00 at 0°C before
loge-transformation, to aid in visualizing differences among the
slopes. Ea is proportional to the negative slope of the
regression relating loge Vmax to the reciprocal
of absolute temperature. An analysis of covariance indicates that none of the
Ea values are significantly different (
=0.05).