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Schematic representation of excitotoxic lesions of the NAC core (A) and shell (B). Shaded areas represent the maximum (black) and minimum (gray) extent of the lesions for the animals included in the behavioral analyses. Coronal sections are taken from the following points in the anteroposterior plane beginning at top left: +2.2, +1.7, +1.6, +1.2, +1.0, and +0.7 mm anterior to bregma (Paxinos and Watson, 1998).