In the equilibrium state the circular patches occupied by the

Abstract

<p><b> and </b><b> phases have areas, respectively, </b><b> and </b><b>.</b> Here we show the ratio at different values of the stimulation . Curves are plotted from top to bottom with increasing ratio of the initial enzymes quantities . Each curve shows two plateaux that are approximatively independent of the signal . For small the system is dominated by the mutual interaction between and , i.e., by the feedback loop, whilst for large the system is dominated by the interaction with receptors, i.e., by the external signal.</p