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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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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.