The olfactory bulb is densely innervated by serotonergic fibers. A study now shows that serotonin activates periglomerular interneurons, which release GABA to reduce transmitter release from olfactory sensory neurons.
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Dugué, G., Mainen, Z. How serotonin gates olfactory information flow. Nat Neurosci 12, 673–675 (2009). https://doi.org/10.1038/nn0609-673
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DOI: https://doi.org/10.1038/nn0609-673
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