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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 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 office desk has 400 times more bacteria on it than a toilet.
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Your heart beats over 36 million times a year.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.