Figure 12.

Electron micrographs illustrating the density of asymmetric synapses onto a CR-labeled dendrite which also contains D₅-IR. CR immunogold label is identified by black arrowheads and is labeled throughout the dendrite. Patches of D₅-IR have been identified as associated with the plasma membrane (white arrows). D₅-IR begins to appear in panel (D), where it is associated with the plasma membrane, and remains visible until panel (G). Over a total perimeter length of 10.2 μm, this CR-labeled dendrite received 1 asymmetric contact (white asterisk) and has a density of 0.1 asymmetric synapses per micron of dendritic perimeter. Scale bar is 500 nm.