From LipidomicsWiki
Sphingolipids and glycerophospholipids are the principal structural components of cellular membranes, with phosphatidylcholine (PC) and sphingomyelin (SPM) being the most abundant. Quantitatively minor membrane phospholipids include the aminoglycerophospholipids phosphatidylserine (PS) and phosphatidyl ethanolamine (PE) and the inositolglycerophospholipid phosphatidyl inositol (PI).
Intracellular metabolism and traffic of these lipids are tightly associated with that of cholesterol traffic (see above Fig.). The above mentioned phospholipids serve as essential regulators of multiple cellular processes, either directly or by their enzymatic degradation resulting in the formation of bioactive lipid signaling molecules.
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