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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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 first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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The horizontal fraction bar was introduced by the Arabs.