Phosphatidylethanolamine is a type of phospholipid, which is a key component of cell membranes. It plays a crucial role in maintaining the structure and fluidity of these membranes, allowing cells to function properly. This molecule is found in various tissues and is particularly abundant in the brain and liver. In addition to its structural role, phosphatidylethanolamine is involved in several cellular processes, including cell signaling and apoptosis, which is the programmed cell death. It can also serve as a precursor for other important molecules, contributing to various metabolic pathways within the body.