,

,

,

,

where , , , , , and .

The law of mass action yields the following nondimensional 3×3 system of nonlinear ODEs:

,

,

,

where , , , and .

There is periodic behavior for , which is confirmed by (1) the sustained oscillations in the time series plot and (2) the limit-cycle in the time-delay reconstruction diagram (both plots are shown in red). This latter diagram is obtained by plotting versus with arbitrarily taken equal to 0.01. A transition occurs at approximately with time series exhibiting damped oscillation for (plot shown in blue) and the time-delay reconstruction diagram collapsing to a single blue point.