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Phosphatidylglycerol (PG) and phosphatidylinositol (PI) share structural similarity.
The Schematic structures for PG and PI are shown, with emphasis placed upon the polar headgroups and their similarities. PtdO is the standard abbreviation for the phosphatidate moiety (containing a glycerolphosphate backbone to which is esterified two fatty acids) found in both the PG and PI classes [54] [55] [56].
