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. 2020 Oct 16;14:575626. doi: 10.3389/fncel.2020.575626

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Copyright © 2020 Ge and Dai.

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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Multiple firing patterns of 5-HT neurons in the DRN. (A) A typical example of single firing neuron, the injected currents (step or ramp) elicited only one action potential (AP). (B) Step current evoked a brief firing in phasic firing type neuron. (C) The tonic firing was evoked by the injected currents (step or ramp) in a tonic firing type neuron. (D) Burst firing, a special tonic firing, was elicited by the injected step or ramp currents. (E) The proportion of each type of neuron in the control and exercise group. A chi-square test showed no significant group difference in proportion of firing patterns (χ² = 0.711, df = 2, p = 0.866).