Complex lipoprotein assemblies are classifi ed according to their densities. Th e greater the amount of protein relative to the amount of lipid, the denser is the lipoprotein. Chylomicrons, which are made up of 99% lipid and only 1% protein, have an extremely low density. T h e other major transport lipoproteins are very-low-density lipoproteins (VLDL), which are 92% lipid and 8% protein, lowdensity lipoproteins (LDL), which are 75% lipid and 25% protein, and high-density lipoproteins (HDL), which are 55% lipid and 45% protein (fi gure 21.28).