Kinetic orders estimated for the G6P ( X
) production term with potential inclusion of all system variables. A) The two indices refer to the two species considered by the interaction; for instance, g26 indicates the effect of X6 (acetate) on G6P production. B) The same parameter sets as shown in A, but ordered individually by magnitude, showing the possible variation admissible each parameter. The light green y-axis represents the region of parameter space with possible activation interaction; analogously, the light red y-axis represents the region of possible inhibition interaction.