Phosphatidylinositol consists of a family of lipids as illustrated on the right, a class of the
phosphatidylglycerides. In such molecules the isomer of the
inositol group is assumed to be the myo- conformer unless otherwise stated. Typically phosphatidylinositols form a minor component on the cytosolic side of eukaryotic
cell membranes. The
phosphate group gives the molecules a negative charge at physiological
pH.