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. 2018 Sep 10;9:1276. doi: 10.3389/fphys.2018.01276

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Copyright © 2018 Fujiwara, Hermann-Luibl, Katsura, Sekiguchi, Ida, Helfrich-Förster and Yoshii.

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 schematic model showing neurotransmitter content in clock neuron clusters. Circles representing neurotransmitters that are filled with black have not been identified yet. Glutamate and DH31 are expressed in the DN_1p neurons but it is not known whether they are co-localized.