And some bacterial cells contain three different types of lipid molecules. So phospholipids, glycolipids and cholesterol molecules. Now, previously we focused on phospholipids and we said that phospholipids come in two types. We have phosphoglycerides and we also have spingolipids. Now in, in this lecture we're going to focus on glycolipids and cholesterol molecules. So let's begin with glycolipids.