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Shares of both are lower after two patients die while taking the drug.
The company says it will take 'several quarters' before it can assess the prospects for Tysabri.
The drug helps maintain remission in patients who were treated for longer than two years.
The drug also improves the cognitive function of multiple sclerosis patients.
The company and Transition Therapeutics are collaborating to develop a new treatment.
Deborah Knobelman says the drug's U.S. sales this year will likely be much lower than she expected.
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