"Even when the clinical trials were going on, Elan Pharmaceuticals was continuing to refine the vaccine, " says JoAnne McLaurin , a professor of laboratory medicine at the University of Toronto who has published scientific papers on AN-1792.

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But perhaps for radon concentration in the air, a radiation level of 5 to 10 picocuries per liter is about right for maximum benefit, speculates Myron Pollycove, a professor emeritus of laboratory medicine and radiology at the University of California, San Francisco.

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"The work is a clear example of the way in which structural studies can contribute to new good ideas about strategies for vaccines, " said Dr Stephen Harrison, head of the Children's Medical Hospital Laboratory of Molecular Medicine.

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He is board certified in internal medicine, diagnostic and laboratory immunology, and allergy and immunology.

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Patrick McNamara, for example, is the head of the Evolutionary Neurobehaviour Laboratory at Boston University's School of Medicine.

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To find out more, researchers from the London School of Hygiene and Tropical Medicine took some A. aegypti mosquitoes in the laboratory, and tempted them with a human arm covered in Deet.

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"My current research interests lie in the field of regenerative medicine, which, simply put, means growing tissues in the laboratory with the aim of safely implanting them when the body cannot heal itself, " he explained.

BBC: Prof Iain Whitaker