Final answer:
Transport proteins located in the cell membrane facilitate the movement of substances into and out of the cell when proteins need to be transported outside of the cell.
Explanation:
Transport proteins are located in the cell membrane and are responsible for moving substances into and out of a cell. When proteins are synthesized and need to be transported outside of the cell, the cell membrane structure is primarily involved in this function. The transport proteins embedded in the cell membrane facilitate the movement of proteins outside the cell.
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