The diffusion of biomolecules in plasma membranes is the key mechanism of their transportation. Lipid rafts, which are diffused on a plasma membrane, carry receptors and proteins. Receptors become the passages where viruses invade, and proteins play an important role in signaling and controlling functions of cells. If we know the characteristics of biomolecular motility and structural differences between normal cells and diseased cells, we could find out how to treat the disease. So, it is very important to develop the method which analyzes the dynamic biomolecular movement in the cell membrane.

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