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Lipids are the building blocks of the fats and fatty substances found in animals and plants. They are microscopic layered spheres of oil, which, in animals, are composed mainly of cholesterol, triglycerides, proteins (called lipoproteins), and phospholipids (molecules made up of phosphoric acid, fatty acids, and nitrogen). Lipids do not dissolve in water and are stored in the body to serve as sources of energy.
Source: Cholesterol | University of Maryland Medical Center http://umm.edu/health/medical/reports/articles/cholesterol#ixzz2kAYpB8f6
University of Maryland Medical Center
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