So we can basically replace this with a serene in which there will be a bond between this phosphorus atom and this oxygen. Or we can remove this and basically attach this phosphorus atom to this oxygen here. Either case, we basically form a modified version of this molecule here. Now let's move on to our sphingolipids. So what's the difference between a phosphorglyceride and a spingolipid? Well, in the case of phosphorglycerides, this component was a glycerol.