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Animals with Fluorogold injections that filled the VTA unilaterally were included in double-labeled analysis. Schematic representation of injection sites from wild-type (a–c) and mutant (d–f) mice that were exposed to the forced swim test (FST). The injection sites and immediate spread of FG for individual animals are indicated by black (WT) or gray (mutant) circles and corresponding animal numbers. Cocaine and control injection sites were comparable.
