(Neuron 105, 992–1006.e1–e6; March 18, 2020)In the original version of the Supplemental Information of this paper, the electron micrographs in the fourth column of Figure S1D were a repetition of the bottom subpanel in the second column. This has now been corrected online, with the fourth column of Figure S1D now deleted. The authors apologize for this oversight.related to Figure 1. Specific labeling and channelrhodopsin expression in hippocampal granule cells (corrected)related to Figure 1. Specific labeling and channelrhodopsin expression in hippocampal granule cells (original)