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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.