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. 2021 Sep 16;15:727883. doi: 10.3389/fnana.2021.727883

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Copyright © 2021 Ai, Luo, Tu, Yang, Jiang, Zhang, Bi, Tu, Yao and Yan.

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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Representative images illustrating DCX+ cellular profiles in the forebrain in a 2 years-old Chinese tree shrew. Panel (A) shows the labeling in the olfactory bulb (OB) and rostral migratory stream (RMS) at four coronal levels, noting the open olfactory ventricle (OV) inside the bulb. Panel (B) shows the labeled cells densely packed at the subventricular zone (SVZ), with migrating granule cells from the subependymal zone (SEZ) to the granule cell layer (GCL). Panel (C) shows labeled cells in the hippocampal dentate gyrus (DG), which are developing granule cells primarily resided along the subgranular zone (SGZ) (D). Panels (E,F) show DCX+ immature neurons localized selectively in the piriform cortex (Pir) over layer II, but not in the adjoining temporal neocortex. Panels (G–I) show high power views of DCX+ neurons in the piriform cortex and amygdala (Amyg), which are remarkably heterogeneous in somal size, shape, and labeling intensity. Other abbreviations are as defined in Figures 1–3. Scale bars are as indicated.