These switches are set off by a chemical signal sprayed on genetically tinkered seed.
ECONOMIST: Terminator genes
In addition, he said, bees had at their disposal a much more powerful chemical alarm signal.
BBC: Honey-bees found to have bite that stuns
Ahead of this year's conclave, spokesman Father Federico Lombardi said the chemical technique had been improved to ensure a clear color signal.
CNN: March 13, 2013 -- Updated 0018 GMT (0818 HKT)
If a chemical or biological agent binds to the electrode, it triggers a signal.
FORBES: Nanotech Takes On Homeland Terror
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