This book provides a concise introduction to phospholipid chemistry and is intended for a broad audience of biologists, biochemists, and graduate students. Developed as part of a graduate course on lipids, this book also serves as a reference for laboratory investigators on signal transduction and biological membranes. The first part of the text is devoted to an orientation to the chemical nature of lipids in general, how they are thought to be associated in the cell, and the methodology by which the cellular lipids (including the phospholipids) can be recovered from cells and subjected to an initial identification. Subsequent chapters characterize the choline-containing phospholipids, including the sphingolipids, the non-choline containing phospholipids, and finally, the so-called minor phospholipids. The latter compounds, which act as agonists or lipid chemical mediators on cells, form a vanguard of a new category of biologically active substances and have set the study of cellular phospholipids on a new and exiting course. Most importantly, this book provides a basis for further inquiry on these complicated molecules, showing that although the compounds are unique, with care and understanding, they can be studied with ease