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"One neuron - one receptor" rule

In the nose, each mature olfactory sensory neuron (mOSN) expresses one allele of a single odorant receptor (OR) gene. This type of expression became known in the field as the "one neuron - one receptor" rule. (Source: Kurian SM, Naressi RG, Manoel D, Barwich AS, Malnic B, Saraiva LR. Odor coding in the mammalian olfactory epithelium. Cell Tissue Res 2021;383[1]:445-56. Creative Commons Attribution 4.0 International [CC BY] license, creativecommons.org/licenses/by/4.0.)