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Functions of membrane proteins can also include cellâcell contact, surface recognition, cytoskeleton contact, signaling, enzymatic activity, or transporting substances across the membrane.
Plasma membrane protein. They are embedded within, and extend across, the phospholipid bilayer. Some species of integral proteins act as membrane channels, providing a pore in the membrane through which specific substances pass.. Others (receptors) serve as a binding site for molecules outside of the cell.