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A comparative Arrhenius plot of the H/T KIEs (log scale) vs the reciprocal of the absolute temperature. The R67-DHFR data are presented as (
) and the cDHFR data[15] as (■). The lines present the exponential fit of the data to the Arrhenius equation. The standard errors for R67-DHFR are much smaller than those for cDHFR because its observed KIEs are also intrinsic, while for cDHFR extensive error-propagation during calculations of intrinsic KIEs inflate the reported errors.[14]
