The fluid mosaic model of cell membranes allows proteins to have lateral mobility within the lipid bilayer and shows an asymmetrical distribution of phospholipids in the membrane.
In the fluid mosaic model of cell membranes, membrane-spanning proteins are not always oriented in the same way in the membrane. These proteins have lateral mobility within the lipid bilayer. Different types of phospholipids are distributed asymmetrically between the inner and outer leaflets of the membrane, creating an asymmetry crucial for the cell's function.
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