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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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Schematic summary of the expression patterns of 5-HTR1A, 5-HTR1B, 5-HTR1D, 5-HTR1E, and 5-HTR5A in the DR and MR in the P1 chick brainstems. Representative expression patterns in sections around A 1.6. A 1.2 are exhibited in colored areas (blue, 5-HTR1A; orange, 5-HTR1B; magenta, 5-HTR1D; green, 5-HTR1E; purple, 5-HTR5A). The dotted pattern indicates that the expressed cells are sparsely distributed. The levels of the sections are in accordance with those mentioned in Kuenzel and Masson’s chick atlas (Kuenzel and Masson, 1988). DR, dorsal raphe; MR, median raphe; P1, post-hatch day 1.