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The cell membrane, also known as the plasma membrane, is a thin, selectively permeable barrier that surrounds all cells, determining what enters and exits. It is crucial for maintaining cellular homeostasis by regulating the movement of ions, molecules, and even larger structures such as vesicles. In the context of mutation, changes to the genetic code can lead to alterations in the proteins comprising the cell membrane, impacting its structure and function. For instance, mutations in genes encoding for ion channels or transporters can modify the permeability properties of the membrane, influencing signal transduction pathways and overall cell behavior. Therefore, understanding how mutations affect the cell membrane is an essential aspect of genetics research, particularly in areas such as neuroscience, immunology, and cancer biology.