Now, lipoproteins are basically molecules that contain protein components as well as lipid components. And lipoproteins are often used to transport fats inside our blood plasma, as we just saw. And there are five different categories of lipoproteins. One of them is the Kylamicrin. Another two important types, two important categories of lipoproteins are the low density lipoprotein, or LDL, and the high density lipoprotein, or HDL. Now, LDL are those lipoprotein particles that are responsible for carrying the fat from the liver or small intestine and two, our fat cells.