Immunoreactivity for the δ2 receptor at different types of synapse
| Category of synapse | Number of PSDs | Total length of PSDs (μm) | Number of gold particles per μm PSDs (± SD) |
|---|---|---|---|
| Parallel fiber–spine | 53 | 15.5 | 19.7 (± 6.3) |
| Parallel fiber–dendritic stem | 5 | 1.1 | 0 |
| Basket/stellate cell synapses | 5 | 1.5 | 0 |
| Mossy fiber synapses | 8 | 2.2 | 0 |
| Climbing fiber synapses | 19 | 4.3 | 0 |
Quantitative assessment of δ receptor immunogold labeling. The data were obtained from a single section (represented in Figs. 1, 2; 15 nm gold particles) to ensure identical incubation conditions. Note selective labeling of postsynaptic densities (PSDs) of synapses between parallel fibers and Purkinje cell spines. The number and total length of the postsynaptic densities are indicated.