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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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The longest a person has survived after a heart transplant is 24 years.
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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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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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