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Low density lipoprotein, illustration
Illustration of a low density lipoprotein (LDL), or 'bad' cholesterol, molecule. It consists of a core of esterified cholesterol molecules surrounded by a shell of unesterified cholesterol and phospholipids. The complex structure includes carrier proteins known as apo-B proteins, which assist transport in the blood. When there are high levels of LDL cholesterol in the blood it builds up on the sides of blood vessels hardening them, a condition named atherosclerosis. This narrows the blood vessels and may block them., by NEMES LASZLO/SCIENCE PHOTO LIBRARY
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