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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.