So we have the nonpolar hydrophobic fatty acids. We have two of them. They can be the same or they can be different. We have our connection, the backbone, the glycerol group, and we have the phosphate group that bears a negative charge on the oxygen, which is delocalized among these two oxygens. So there is an electric dipole moment in the phosphate group and that's exactly why it's a polar molecule. So sometimes attached to our phosphate, we also have an additional polar group known as the choline.