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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.
Other membrane proteins serve as enzymes that catalyze vital processes; for example, the harvest of energy from food. A variety of membrane proteins are receptors, signal transducers that transmit stimuli received outside the cell (for example, hormone or odor molecules) to functional proteins inside.