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In page Phospholipid:

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Phospholipids[1] are a class of lipids whose molecule has a hydrophilic "head" containing a phosphate group and two hydrophobic "tails" derived from fatty acids, joined by an alcohol residue (usually a glycerol molecule). Marine phospholipids typically have omega-3 fatty acids EPA and DHA integrated as part of the phospholipid molecule.[2] The phosphate group can be modified with simple organic molecules such as choline, ethanolamine or serine.[citation needed]