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Examples of Fos plumes surrounding microinjections. A Fos plume surrounding a DNQX microinjection site in nucleus accumbens (left) is shown compared with vehicle control microinjection. Colored plume map shows average elevations of Fos caused by DNQX microinjection, relative to vehicle. The 2.5-mm rostrocaudal extent of the medial shell can contain up to eight adjacent plume centers or two to three halos without overlapping, perhaps accounting for keyboard effects.
