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. 2016 Apr 12;10:39. doi: 10.3389/fnana.2016.00039

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Copyright © 2016 Voisin, Mnie-Filali, Giguère, Fortin, Vigneault, El Mestikawy, Descarries and Trudeau.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor 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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Expression of 5-HT reuptake transporter (SERT) and vesicular glutamate transporter (VGLUT3) in cultured serotonin (5-HT) neurons. (A) Cultured 5-HT neurons display a highly developed axonal arborization, even after 1 day in vitro (DIV). Photomicrographs taken with a 20× magnification illustrating 5-HT and microtubule associated protein 2 (MAP2) immunoreactivity. The white arows identify non-5-HT neurons. These illustrations show that axonal and dendritic processes of 5-HT neurons are uniformly 5-HT immunoreactive. The orange arrows in the zoomed area (identified by the white box) show 5-HT neuron dendrites, while the green arrows identify axonal domains of the same neuron. (B) Photomicrographs taken with a 20× magnification illustrating SERT positive neurons expressing VGLUT3 at 1 DIV. (C) Photomicrographs taken with a 20× magnification illustrating SERT positive neurons expressing VGLUT3 at 7 DIV. (D) Bar graph representing the proportion of SERT positive neurons expressing VGLUT3 protein at 1, 3 and 7 DIV. Scale bar = 100 μm (20× magnification) or 5 μm (crop).