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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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There are 20 feet of blood vessels in each square inch of human skin.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.