Cephalin is a phospholipid widely used in medical and biochemical research due to its presence in cell membranes, particularly in brain tissue. It is essential for studying blood coagulation processes, providing the phospholipid surface necessary for activating the intrinsic pathway and playing a key role in the clotting cascade. In laboratories, cephalin serves as a reagent in clotting tests, such as the activated partial thromboplastin time (aPTT) test, to evaluate coagulation and diagnose bleeding disorders. It is also employed in neuroscience research to investigate membrane dynamics and signal transduction in neural cells. Furthermore, its lipid properties are utilized in the development of drug delivery systems, such as liposomes for targeted therapy.