LDL cholesterol (the "bad" cholesterol) is a serum lipoprotein that contains ApoB, cholesterol and triglycerides. LDL is the most atherogenic of the lipoproteins. Recent evidence suggests that the oxidized form of LDL may play a key role in the initiation and progression of atherosclerosis, and like lipoprotein(a), oxidized LDL forms foam cells which are associated with the formation of atherosclerotic plaques.

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