Table 2. Reactions in the stochastic model.

	Reaction	Description	Rate
R1	Y → X	Activation	$\frac{1}{\epsilon }f(n_X,a)n_Y$
R2	X → Y	Inactivation	$\frac{1}{\epsilon }g\left(n_X\right)n_X$
R3	⌀ → Y	Production	kXΩ
R4	X + Y → ⌀	Degradation of inactive protein	nX nY/Ω
R5	X + X → ⌀	Degradation of active protein	nX(nX − 1)/Ω