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. So that's step one. So at a time of zero, the membrane is labeled with fluorescent molecules. Now, let's suppose at time of T one, what we basically do is we choose a certain area, a certain region of that particular membrane.