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. 2021 Oct 15;15:647117. doi: 10.3389/fnins.2021.647117

FIGURE 6.

FIGURE 6

The sleep-promoting PB interneurons form synaptic contacts with the wake-promoting PFN neurons. (A) The dendritic arbors and presynaptic terminals of the PFN neurons in R52B10-Gal4 were visualized by expression of the postsynaptic marker DenMark and the presynaptic marker syt-GFP, respectively. (B) The neuronal connection of the sleep-promoting PB interneurons to the wake-promoting PFN neurons was revealed using the t-GRASP method. The pre-t-GRASP and the post-t-GRASP encode the split-GFP fragments, which are targeted to presynaptic endings and dendritic terminals, respectively. Maximum-intensity projection of the confocal images of the brain expressing pre-t-GRASP with R59E08-Gal4 and post-t-GRASP with R52B10-LexA. Scale bars represent 100 μm.