The sensory neurons in the nose are the first in this neural code. An electrical signal is started when an odor molecule attaches to a receptor and travels from the sensory neurons to the olfactory bulb.
A G protein and adenylyl cyclase are activated when an odorant molecule binds to an olfactory receptor protein, producing cAMP.
The MOB of most mammals is composed of seven roughly concentric layers, starting from the surface and going in the following order: (1) olfactory nerve layer (ONL), (2) glomerular layer (GL), (3) external.
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