Membranes are generally symmetrical, i.e., the outer face is composed of the same number and types of phospholipids as the inner face.

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Biological membranes are generally asymmetrical, meaning the composition of phospholipids, proteins, and other components can differ between the inner and outer faces of the membrane. This asymmetry is important for the function of the membrane, including cell signaling and transport.

Membranes Are Generally Symmetrical, I