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Such a combinatorial code has been proposed for the differentiation of projection neurons of the somatic and visceral components of cranial nerves. It is possible that individual neuronal cell types are not specified by unique transcription factors but rather emerge through the intersection of their expression domains. Brn3a, Brn3b, and Brn3c, in combination with each other and\/or transcription factors of other families, can define subgroups of retinal ganglion cells (RGC), spiral and vestibular ganglia, inner ear and vestibular hair cell neurons in the vestibuloacoustic system, and groups of somatosensory neurons in the dorsal root ganglia. The present study investigates the expression and potential role of the Brn3b transcription factor in cranial nerves and associated nuclei of the brainstem. We report the dynamic expression of Brn3b in the somatosensory component of cranial nerves II, V, VII, and VIII and visceromotor nuclei of nerves VII, IX, and X as well as other brainstem nuclei during different stages of development into adult stage. We find that genetically identified Brn3b<jats:sup>KO<\/jats:sup> RGC axons show correct but delayed pathfinding during the early stages of embryonic development. However, loss of Brn3b does not affect the anatomy of the other cranial nerves normally expressing this transcription factor. J. Comp. Neurol. 524:1033\u20131061, 2016. \u00a9 2015 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/cne.23890","type":"journal-article","created":{"date-parts":[[2015,9,10]],"date-time":"2015-09-10T17:10:23Z","timestamp":1441905023000},"page":"1033-1061","source":"Crossref","is-referenced-by-count":16,"title":["Dynamic expression of transcription factor Brn3b during mouse cranial nerve development"],"prefix":"10.1002","volume":"524","author":[{"given":"Szilard","family":"Sajgo","sequence":"first","affiliation":[{"name":"National Eye Institute National Institutes of Health Bethesda Maryland 20892"},{"name":"Molecular Biology Center Interdisciplinary Research Institute on Bio\u2010Nano\u2010Science, Babes\u2010Bolyai University Cluj\u2010Napoca Cluj 400084 Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seid","family":"Ali","sequence":"additional","affiliation":[{"name":"National Eye Institute National Institutes of Health Bethesda Maryland 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