CETP (Cholesteryl Ester Transfer Protein): CETP is a protein that plays a crucial role in lipid metabolism by facilitating the transfer of cholesteryl esters and triglycerides between lipoproteins. It affects the composition of HDL (high-density lipoprotein) and LDL (low-density lipoprotein), making it significant for cardiovascular health. CETP inhibitors have been researched as potential treatments for atherosclerosis due to their ability to raise HDL cholesterol levels.