A gene for the receptor of a given odorant is expressed
in an individual in only a few neurons.
Ngai et al. 1993 classified individual olfactory
neurons in the olfactory epithelium of the catfish
(Ictalurus punctatus). Only 0.5–2% of all olfactory
neurons recognize a given receptor
probe such as probe 202 (1) or 32 (2). Odors are
distinguished in the brain according to which
neurons are stimulated. The topographical
position of each neuron is specific for each
odorant.
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