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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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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.
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Cyanide works by making the human body unable to use oxygen.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.