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What function does the cell or plasma membrane serve?
That's really helpful. On a related note, how does the plasma membrane differ between different types of cells?
The plasma membrane can differ between cell types in terms of its composition and function. For example, nerve cells have a unique type of membrane called a myelin sheath that helps to insulate and protect the nerve fibers. Additionally, some cells, like red blood cells and sperm cells, don't have a nucleus and thus have a more simple membrane structure.