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PARIS:One policeman was killed and another wounded in a shooting incident in central Paris on Thursday night, a police source said.A person who fired on police on the Champs-Elysees shopping boulevard just days ahead of France's presidential election has been killed, the source said.A police source also said there had been two assailants, and a witness told Reuters that one man got out of a car at th
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e scene and began shooting with a machine gun.Police authorities called on the public to avoid the area.A Reuters reporter saw a helicopter flying low over central Paris, apparently part of a follow-up police operation.Five dead as terror strikes in heart of LondonFrench TV channel BFM broadcast footage of the Arc de Triomphe monument and top half of the Champs Elysees packed
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with police van
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s, lights flashing and heavily armed police shutting the area down after what was described by one journalist as a major exchange of fire nears a Marks and Spencers store.The incident came as French vote Old muscle got a shot of yo
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uthful vigor in a stem cell experiment by bioengineers at the University of California, Berkeley, setting the path for research on new treatments for age-related degenerative conditions such as muscle atrophy or Alzheimer's and Parkinson's diseases.Old muscles renewed Irina Conboy and Morgan Carlson have learned how to trigger the rejuvenation of old, damaged muscles. View full-size video In a new study published June 15 in an advanced online issue of the journal Nature, researchers identified two key regulatory pathways that control how well adult stem cells repair and replace damaged tissue.They then tweaked how those stem cells reacted to those biochemical signals to revive the ability of muscle tissue in old mice to repair itself nearly as well as the muscle in the mice's much younger counterparts.Irina Conboy, an assistant professor of bioengineering and an investigator
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at the Berkeley S
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tem Cell Center and at the California Institute for Quantitative Bio