The cells regained a startling amount of function, but the brains didn't have activity linked with consciousness. Ethicists say it challenges assumptions about the irreversible nature of brain death.
The Yale University research team is careful to say that none of the brains regained the kind of organized electrical activity associated with consciousness or awareness. Still, the experiment described Wednesday in the journal Nature showed that a surprising amount of cellular function was either preserved or restored. | 
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