And we'll see exactly what the difference is between these two phospholipids in just a moment. First, let's discuss the constituents, the components that make up any phospholipids. So let's take a look at the following list. Number one, we'll always find a platform molecule, a molecule that acts as the backbone of attachment for the other groups, in the case of the phosphoglycerides will have a glycerol that acts as a backbone. In the case of the spingolipids, will have a slightly different platform molecule known as a spinocine. Now, they always have fatty acids.