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Photomicrographs illustrating Fos immunoreactive neurons in the accumbens (Acb) in the 1 (1d) and 6 (6d) day cocaine self-administration (SAC) groups. b and d are enlargements of the boxed areas in a and c, respectively. ac, anterior commissure; co,Acb core; sh, Acb shell; CPu,caudate-putamen; ICj,island of Calleja; ICjm,island of Calleja magnus; l,lateral ventricle. Scale bar: 1 mm in a, c, and e; 200 μm in b, d, and f.
