Just when it seems like all the beasts have been captured, a hundred more types spring up from the radioactive earth every few years without fail.

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Dr. Snyder believes D-serine is there as a fail-safe to make sure memory cells spring into action only when they are supposed to--a process that breaks down during a stroke.

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Snyder believes that D-serine is there as a fail-safe to make sure that memory cells spring into action only when they are supposed to--a process that breaks down during a stroke.

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