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. 2022 Jan 17;12:815997. doi: 10.3389/fphys.2021.815997

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Copyright © 2022 Fujita, Aoki, Mori, Fujita, Matsushima, Homma and Yamaguchi.

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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Comparison of the 5-HTR1A and 5-HTR1B expression patterns in the optic tectum in the P1 chick brainstem sections. Magnified views of the regions of the optic tectum to compare layers of 5-HTR1A-expressing and 5-HTR1B-expressing areas. Numbers represent tectal layers according to Ramón y Cajal (1911). The leftmost alphabetical system of nomenclature is in accordance with that mentioned in Kuenzel and Masson’s chick atlas (Kuenzel and Masson, 1988). SAC, stratum album centrale; SGC, stratum griseum centrale; SGFS, stratum griseum et fibrosum superficiale; SGP, stratum griseum periventriculare; SO, stratum opticum; P1, post-hatch day 1. Scale bars = 250 μm.