Table 1.

Immunoreactivity for the δ2 receptor at different types of synapse

Category of synapseNumber of PSDsTotal length of PSDs (μm)Number of gold particles per μm PSDs (± SD)
Parallel fiber–spine5315.519.7 (± 6.3)
Parallel fiber–dendritic stem51.10
Basket/stellate cell synapses51.50
Mossy fiber synapses82.20
Climbing fiber synapses194.30
  • 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.