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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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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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There are more nerve cells in one human brain than there are stars in the Milky Way.