Once the cremations have been removed from the urns, the bones will be cleaned and dried under laboratory conditions.

BBC: Secrets of St Albans' Roman burial urns unlocked

"What was seen under laboratory conditions has probably already taken place in any number of commercial fishing grounds, " warned the researchers.

BBC: Fish on a trawler boat

Samples of 400-year-old plants known as bryophytes have flourished under laboratory conditions.

BBC: Centuries-old frozen plants revived

But Lisa Watson of Monsanto cautioned that the Cornell study was conducted under laboratory conditions and may not accurately reflect Bt's impact in farm fields.

CNN: Researchers find bio-engineered corn harms butterflies

This is largely because cars are never actually tested out on the road, but rather in a laboratory under strictly controlled conditions that are designed to simulate city and highway.

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Under the right conditions, these cells can replenish themselves indefinitely in the laboratory, and they can, in theory, turn into any type of cell in the body.

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