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. 1999 Aug 1;19(15):6488–6496. doi: 10.1523/JNEUROSCI.19-15-06488.1999

Fig. 4.

Fig. 4.

Histogram comparing the percentage (Mean ± SD) of dendritic membrane of GPe and GPi neurons not contributing to any synaptic junctions (no synapse) or involved in the formation of symmetric and asymmetric synapses, with the percentages of membrane-bound gold particle labeling for group I mGluRs on pallidal dendrites. The total membrane length and total length of symmetric and asymmetric synaptic active zones were measured from 40 dendrites randomly selected in GPe and GPi. The percentages of membrane-bound gold particles associated with group I mGluR immunoreactivity are the averages of mGluR1a and mGluR5 labeling in GPe and GPi depicted in Figure 3A. Note that the percentage of dendritic membrane contributing to the formation of symmetric synapses is significantly lower than the proportion of group I mGluR immunogold labeling at striatopallidal synapses.