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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.
Transport Proteins. Transport proteins, the final type of integral protein, extend through the membrane and transport materials in and out of the cell. Some transport proteins actively move materials in and out of the cell, while other simply provide an opening for materials to passively move.hospholipids make up the membrane and create the barrier between the cell's contents and area outside the cell. Two types of proteins are found in the cell membrane: integral and peripheral proteins.