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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The familiar sounds of your heart are made by the heart's valves as they open and close.