"Photosynthesis is not the only example of quantum effects in nature. For instance, researchers have known for several years that in some enzyme-catalysed reactions, protons move from one molecule to another by the quantum-mechanical phenomenon of tunnelling, in which a particle passes through an energy barrier rather than having to muster the energy to climb over it. And a controversial theory of olfaction claims that smell comes from the biochemical sensing of molecular vibrations — a process that involves electron tunnelling between the molecule responsible for the odour and the receptor where it binds in the nose."

The Dawn Of Quantum Biology } Philip Ball, Nature News 

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