Lipid structures and phases. (a) The structure of the major
glycerophospholipids phosphatidic acid (PA), phosphatidylcholine
(PC), phosphatidylethanolamine (PE), phosphatidylserine (PS) and
phosphatidylinositol (PI), which differ only in the group indicated by
X. Yellow indicates the hydrophobic tail; orange indicates the
charged headgroup, which can be anionic or, where there is a
positive and a negative charge, zwitterionic. (b) Lipids with a
cylindrical shape, such as PC, pack as bilayers. (c) Lipids with a
conical shape, such as PA or PE, pack in curved structures such as
the hexagonal HII phase.
Lipid structures and phases. (a) The structure of the majorglycerophospholipids phosphatidic acid (PA), phosphatidylcholine(PC), phosphatidylethanolamine (PE), phosphatidylserine (PS) andphosphatidylinositol (PI), which differ only in the group indicated byX. Yellow indicates the hydrophobic tail; orange indicates thecharged headgroup, which can be anionic or, where there is apositive and a negative charge, zwitterionic. (b) Lipids with acylindrical shape, such as PC, pack as bilayers. (c) Lipids with aconical shape, such as PA or PE, pack in curved structures such asthe hexagonal HII phase.
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