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. 2019 May 22;9(5):118. doi: 10.3390/brainsci9050118

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Relative expression levels of c-Fos, BDNF, NR1, and NR2A in the medial prefrontal cortex (mPFC) and amygdala of 5-HTT^−/− and 5-HTT^+/+ rats following fear extinction learning during preadolescence (p24), adolescence (p35), and adulthood (p70). #: a significant effect of genotype (p < 0.05); ~: a trend-level significant effect of genotype (p = 0.086); $: a significant effect of age (p < 0.05); ¥: a significant age × genotype interaction (p < 0.05); *: a significant post hoc difference between 5-HTT^−/− vs. age-matched 5-HTT^+/+ rats (p < 0.05).