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All biological membranes, including plasma membranes and all organelle membranes, contain lipids and proteins. The lipids found in biomembranes are mainly phospholipids and cholesterol. In the plasma membrane and some of organelle membranes, proteins and phospholipids are attached to carbohydrates, forming glycoproteins and glycolipids, respectively.
Figure 1-B-1. Schematic drawing of a typical plasma membrane.
Review Articles: Lipid rafts: heterogeneity on the high seas - Biochem. J., 2004.
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