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. 2019 Jun 4;13:123. doi: 10.3389/fnbeh.2019.00123

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Copyright © 2019 Lukić, Getselter, Koren and Elliott.

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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Germ free (GF) mice exhibit different gene expressions in dorsal raphe nucleus (DRN) compared to specific pathogen free (SPF) mice. GF mice have higher expression of tryptophan hydroxilase 2 (TPH2; A), serotonin autoreceptor 5-HT1A (B) and serotonin transporter (SERT; C) compared to SPF mice. *p < 0.05, ***p < 0.001, two-tailed t-test, N = 10 mice per group.