Powerful topographic techniques are now available, among which autoradiographic and fluorescent mapping are the most prevalent. These techniques produce images that usually do not correlate with brain anatomy; subsequent staining is required to allow a precise association between the parameter(s) investigated and brain structures. A simple staining procedure is described, compatible with heat-fixed brain sections, and that was found particularly valuable in association with topographical tissue pH studies using the fluorescent pH indicator umbelliferone.
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