And notice that at that particular section, we no longer see that same type of color, but over time, we see that the color basically returns because of lateral diffusion along that membrane. So this graph demonstrates the recovery of fluorescence in that Bleached area. It confirms the existence of this phenomenon we call lateral diffusion. Now, the question is, what determines the rate at which that area actually recovers its fluorescence? So what determines the slope of this particular line? Because the slope is ultimately the rate of recovery of fluorescence.