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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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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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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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Cyanide works by making the human body unable to use oxygen.

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