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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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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.
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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Some organisms used as models in genetic research
The greatest bone mass is found around age 30 for both men and women, with the later decline being f
Selected Antifungal Drugs
Selected Antiemetics
Productivity in Selected Industries in the Early 1990s
Properties of Selected Bacterial, Eukaryotic, and Archaeal DNA Polymerases