The scientists say their results could have far-reaching consequences for understanding nerve regeneration.

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There were hundreds that could have been the one that stopped nerve regeneration and was suppressed by the antibody.

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Data from an early stage trial of 20 people suggested the Sangamo drug, called SB-509, may not only protect nerves from further damage but possibly help in nerve regeneration as well.

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"The maximum speed is an inch a month for nerve regeneration, " Dr W P Andrew Lee, who led the 13-hour surgery last month at Johns Hopkins Hospital in Baltimore, Maryland, told a news conference on Tuesday.

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Prof Franklin said the procedure might be used alongside drug treatments to promote nerve fibre regeneration and bioengineering to substitute damaged neural networks.

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