Before revision:  Here, we outline a largely analytical method for studying reaction-diffusion models . Using a prototypic model of cell polarization, we characterize protein activation in response to an external stimulus and highlight the importance of phase-space analysis. We demonstrate how comprehensive treatment of the phase space can guide experimental design and supplement simulation studies.
After revision:  Here, we outline a largely analytical method for studying reaction-diffusion models and analyzing their stability properties. Using two representative biological examples, we demonstrate how this approach can guide experimental design and supplement simulation studies.