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. Author manuscript; available in PMC: 2019 Aug 1.
Published in final edited form as: Pharmacol Biochem Behav. 2018 Jun 14;171:54–65. doi: 10.1016/j.pbb.2018.06.002

Figure 1.

Figure 1

Photograph of a modified osmotic minipump showing an assembled gating device connected to a standard osmotic minipump (model 2ML4, Alzet Osmotic Pumps, Cupertino, CA).