Complex lipoprotein assemblies are classified according to their densities. The 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. The 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).