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DSPE (1,2-Distearoyl-sn-glycero-3-phosphoethanolamine) is a saturated, zwitterionic phospholipid belonging to the phosphatidylethanolamine (PE) class, featuring two C18:0 stearic acid acyl chains. PE is synthesized mainly from CDP-ethanolamine and diacylglycerol, playing a role as a core component of cellular membranes. DSPE is a key component in advanced lipid-based drug and gene delivery systems, where it is often conjugated with polyethylene glycol (PEG) to create "stealth" liposomes with extended circulation times.