Chunk #10 — Material and methods — I. Heroin self-administration, extinction, foot shock- and heroin- induced reinstatement — 4. Procedure

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Individual differences in gene expression of vasopressin, D2 receptor, POMC and orexin: vulnerability to relapse to heroin-seeking in rats.

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The behavioral experiment consisted of three phases: self-administration, extinction, and reinstatement (see Fig. S1).