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. 2020 Feb 18;14:126. doi: 10.3389/fnins.2020.00126

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Copyright © 2020 Ueha, Ueha, Kondo, Nishijima and Yamasoba.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A,B) Representative immunohistochemical images of olfactory marker protein (OMP)⁺ mature olfactory receptor neurons (ORNs) in the olfactory epithelium (A) 40× magnification; (B) 400× magnification). Each box (a–c) in (A) indicates the region of the olfactory epithelium shown at a representative higher magnification in (B,a) nasal septum; (b) upper-lateral area; (c) uppermost-lateral area. Comparative charts of cell counts of OMP⁺ ORNs in each group are shown. ****P < 0.0001 (n = 6, one-way analysis of variance). OVA, ovalbumin; CSS, cigarette smoke solution.