Now, the question is, why is this the case? Well, because of phenomenon known as lateral diffusion. And what that means is the molecules that constitute the phospholipids and in many cases, the proteins that constitute the membrane are actually in a constant state of horizontal lateral emotion. And to visualize the lateral diffusion of these lipid molecules or proteins within our cell membrane, we can basically use a technique, a process known as fluorescence recovery after photo bleaching, which basically is also known as FRAP. So what we basically do is we take the membrane and we attach these fluorescent molecules onto the membrane. And what these fluorescent markers will basically help us do is help us visualize the movement of these molecules, the lipids and the proteins within our membrane.