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Schematic of the arrangement of the DPPC and DPPE headgroups in the bilayer. DPPC and DPPE are represented as ovals (large headgroup) and circles (small headgroup), respectively. The plus-symbol represents the charge in the choline or amine group, and the minus-symbol the charge in the phosphate group. Orientation of the bilayer and DPPE mole fraction are shown in the figure. Water and lipid tails are excluded for clarity.
