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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.