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Glycocalyx
The Glycocalyx is a layer of outward facing glycoproteins that lay on the surface of the plasma membrane. They are important in cell interactions as they function as cell adhesion molecules and plasma membrane receptors. They can be used as "velcro" to stick themselves to molecules in the extracellular space, as "arms" used to move past other cells, as signals to protect injured areas, or as sensors to respond to tension at the cell surface.