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. 2019 Apr 2;20(7):1639. doi: 10.3390/ijms20071639

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Anatomical and morphological organization of the zebrafish olfactory system. (A) Localization of the olfactory system in zebrafish. Dorsal side is shown; rostral side is located upwards; (B) Olfactory organ morphology. Olfactory sensory epithelium arranged in lamellae is shown in black; (C) Olfactory epithelium (OE), composed of the following olfactory sensory neurons (OSNs): microvillous (mv); ciliated (cl); crypt (cr); kappe (kp); and pear (pr) OSNs. OSNs extend their axons to the olfactory bulb via the olfactory nerve (ON) to form discrete glomeruli; (D) Olfactory bulb organization in three laminae: olfactory nerve layer (ONL); glomerular layer (GL); and intracellular layer (ICL).