Carraguard is the proprietary name of a substance made from carrageenan, a carbohydrate gel derived from seaweeds that is widely used as a stabiliser in the food industry.

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The stabiliser was found in the wreckage on Monday, Mr Chernov said.

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Further tests showed that DISC1 acts like lithium, a drug commonly prescribed as mood stabiliser to patients with mental illness, inhibiting the action of a key chemical in the brain.

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