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Electrode track in the basal forebrain. (top) Nissl-stained section showing the sub-nuclei of the basal forebrain (BF). Arrowheads indicate the track of a silicon probe. ac, anterior commissure; VP, ventral pallidum; SI, substantia innominate; HDB, nucleus of the horizontal limb of the diagonal band. (bottom) The tip of a silicon probe was located within the BF (HDB or SI) based on DiI staining. Green signals indicate ChR2-EYFP.
