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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Physiol Behav. 2014 Nov 9;139:127–135. doi: 10.1016/j.physbeh.2014.11.002

Figure 5.

Figure 5

Regression of dopamine D2 receptor mRNA levels in the caudate putamen (CPu) and foot shock stress-induced lever responding during 3-hour reinstatement session in the H-RI rats (heroin SA rats with “high” reinstatement induced by acute foot shock stress) and the L-RI rats (heroin SA rats with “low” reinstatement induced by acute foot shock stress). There was a significant correlation between the D2 mRNA level in the CPu and the stress induced responding in all heroin SA rats, both the H-RI (•) (n = 9) and L-RI (○) animals (n = 9).