Edwards was awarded the Nobel Prize in Physiology or Medicine in 2010 for his work in developing the technique.

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Columbia University's Richard Axel, whose work on mapping the genes and receptors of our sense of smell garnered the 2004 Nobel prize for physiology, said the kinds of experiments revealed this week would not resolve the debate - only a microscopic look at the receptors in the nose would finally show what is at work.

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Dr Buck was awarded the physiology or medicine prize, along with Richard Axel of Columbia University in New York, for their work in investigating the sense of smell.

ECONOMIST: The Nobel prizes