By contrast, in the membranes involved in ATP production (such as the internal membranes of mitochondria and chloroplasts), approximately 75% is protein.
In the myelin membrane, which serves mainly as electrical insulation for nerve cell axons, less than 25% of the membrane mass is protein. Accordingly, the amounts and types of proteins in a membrane are highly variable. It is the proteins, therefore, that give each type of membrane in the cell its characteristic functional properties. Although the basic structure of biological membranes is provided by the lipid bilayer, membrane proteins perform most of the specific functions of membranes.
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