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Experiment 2. (a) Acquisition of cocaine self-administration in rats assigned to receive one of two daily treatments (stressed or unstressed) during Days 2 to 8 of subsequent forced abstinence from cocaine self administration. See Fig. 2a for other details. (b) Weight change in chronically stressed and unstressed rats (n = 8–9/treatment condition). All data in figure are represented as mean ± SEM.
