APOB (Apolipoprotein B): Apolipoprotein B is a principal component of low-density lipoproteins (LDL), which are carriers of cholesterol in the blood. APOB exists in two main isoforms, APOB-48 and APOB-100, with the latter being integral to the structure of LDL particles. APOB-100 serves as a ligand for LDL receptors, facilitating the uptake of LDL particles by cells and thus playing a crucial role in lipid metabolism and transport. Elevated levels of APOB-containing lipoproteins are strongly associated with an increased risk of atherosclerosis and cardiovascular disease, as they contribute to the formation of plaques that can narrow or block blood vessels....