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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: Physiol Behav. 2017 Mar 8;178:117–125. doi: 10.1016/j.physbeh.2017.03.006

Figure 1.

Figure 1

Schematic of the visible burrow system (VBS). The chambers and surface area contained standard chow and water. Chambers and tunnels were kept under constant darkness, whereas the open surface area was under a 12:12 light cycle.