About the structure and biological function of PE Structure. Phosphatidylethanolamines (cephalins, PtdEtn, GPEtn, or PE) belong to the group of ester phospholipids within the phospholipids. Their structure consists of a glycerol backbone linked to two fatty acids and a phosphoethanolamine molecule. The fatty acids can be of variable length, hydroxylated, and contain double bonds. Function. … Continue reading Phosphatidyl­ethanolamine