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Electron micrographs showing dendritic shafts and spines containing gold–silver immunoreactivity for PRV. InA, two PRV-labeled dendrites (PRV-d) receive asymmetric synapses (curved arrows) from unlabeled terminals (Ut). In B, a labeled dendritic spine (PRV-s) emanates from a PRV-labeled dendrite. The labeled spine receives an asymmetric synapse from an unlabeled terminal. Two other PRV-labeled dendrites are also present in this field. Scale bar, 0.25 μm.
