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Cultivating concerns: Paul Lazzeri of the Integrated Approach to Crop Research-Rothamsted with a display of genetically modified spring wheat at the Royal Agricultural Show in Stoneleigh, Warwickshire this week. The wheat contains extra gluten genes to improve its bread-making quality.

But Jim Thomas of Greenpeace warned: "Genetic engineering is an imprecise and unpredictable technology. Releasing genetically engineered material into the environment will have unpredictable consequences."