Fig. 1 S1
Overview of the experimental procedure.(A) Retinas were removed from transgenic zebrafish that expressed Vglut1-paRFP fusion protein after heat shock. (B) Intact, acutely dissociated retinal BPCs were voltage-clamped via a whole-cell patch pipette placed on the synaptic terminal. (C) Electron micrograph showing the synaptic terminal of a zebrafish BPC, with the boxed region around a ribbon at higher magnification in the inset. Ribbons are surrounded by tethered synaptic vesicles. (D) Cartoon illustrating photoactivation of paRFP by 405-nm light. (E) Example of red fluorescence in the synaptic terminal before and after photoactivation.