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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: Colloids Surf B Biointerfaces. 2011 Mar 8;85(2):293–300. doi: 10.1016/j.colsurfb.2011.02.037

Figure 1.

Figure 1

The figure shows the phosphatidylcholine (top) and phosphatidylserine (bottom) headgroup chemical structure and charges, including the Na+ counterion position.