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High Quality Content by WIKIPEDIA articles! The Vibration theory of smell proposes that a molecule's smell character is due to its vibrational frequency in the infrared range. The theory is opposed to the more widely accepted shape theory of olfaction, which proposes that a molecule's smell character is due to its shape. The current vibration theory has recently been called the swipe card model, in contrast with lock and key models based on shape theory. As proposed by Luca Turin, the odorant molecule must first fit in the receptor's binding site. Then it must have a vibrational energy mode compatible with the difference in energies between two energy levels on the receptor, so electrons can travel through the molecule via inelastic electron tunneling, triggering the signal transduction pathway.

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