[Fluorescence histochemical investigations on the distribution of GABA in the hippocampus of rat (author's transl)].

1. In the hippocampal region of the rat brain GABA was demonstrated with a modified reaction according to WOLMAN (1971). 2. In the various regions of hippocampus different intensities of GABA-fluorescence were demonstrable: A maximum of intensity being present in the area dentata and in the CA 3 region; it is very low in the CA 1 and CA 4 region. 3. The fluorescence of GABA was found to be localized around the pyramidal neurons and the dentate granule cells, respectively.