Referring to a biological structure, especially organelles or molecules, that are enclosed within a cellular membrane. This membrane acts as a barrier, separating the internal environment from the external, and controlling the passage of substances. membrane-bound structures are crucial for compartmentalization within cells, allowing for specialized functions and reactions to occur in distinct locations. These structures often have specific protein components within the membrane to facilitate transport and other interactions. The term emphasizes the confinement of the entity within a phospholipid bilayer membrane, highlighting its independence and functional role within the cell.
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