Fig. 2.

GAD65 labels synaptic boutons. Electron photomicrographs showing GAD65 immunolabeling of synaptic terminals in 18-d-old cultured hippocampal neurons. In both A andB, DAB reaction product is localized to vesicle-filled synaptic boutons contacting unlabeled dendrites (filled arrows). Open arrows indicate unlabeled axo-dendritic synaptic terminals. Magnification: 20,000× (A); 30,400× (B).