Web Extra: Bad Side Effects

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It appears results of a recent Alzheimer’s study aren’t as positive as investors had first thought.

Shares of Wyeth and Elan sold-off after analysts said the new data on bapineuzumab, released Tuesday, presents significant safety issues and makes it less likely the drug will reach the market.

Questions regarding bapineuzumab are likely to linger until the arrival of more data, which isn't expected until 2010.

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