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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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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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