By Ashwin Kelkar Introduction What constitutes a cell?  In a very general sense, the first successful cell-like structures necessitated a biological barrier that would mediate the flow of molecules into and out of their “bodies.”  What developed was the phospholipid bilayer, a semi-permeable membrane intermeshed with various proteins to regulate the passage of important bioactive molecules – ones that regulate cellular responses – in order … Continue reading More Than a Structural Component: The Vast Biological Functions of Sphingolipids