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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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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.