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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
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The human body produces and destroys 15 million blood cells every second.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.