Phospholipids: Phospholipids are a class of lipids that are the main structural components of cell membranes. They consist of a glycerol backbone, two fatty acid chains, and a phosphate group, which can be further modified with various polar head groups.
Phosphatidylinositol: Phosphatidylinositol is a type of phospholipid that contains inositol as its polar head group. It is involved in cellular signaling pathways and plays a role in the regulation of various cellular processes.
Phosphoinositide: Phosphoinositides are a group of phospholipids that contain inositol as their polar head group and are further phosphorylated at different positions on the inositol ring. They serve as important signaling molecules in the cell.