"We may get rid of plaques, but it may not do anything, " says John Trojanowski of the University of Pennsylvania.

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"Ashley Bush has built a nice story around the laboratory data that looks like it is moving well into patients, " Trojanowski says.

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Trojanowski, co-director of the Center for Neurodegenerative Disease Research at the University of Pennsylvania, says that the results are "encouraging, " even though they have to be confirmed in much larger clinical trials.

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