Scientists have managed to restore cell function in the brains of pigs hours after they died, in a breakthrough on Wednesday that experts said threw into question the very notion of what makes animals – or even humans – alive.Authors of the US-based study said their research could one day be used to help treat victims of heart attacks and strokes and unravel the mysteries of brain trauma.In human and large mammal brains, cells crucial for neural function begin to degrade as soon as blood supply…

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