J Representative images of 8-week-old newborn granule neurons of WT and Tau-/- mice infected by a PSD95-GFP-expressing retrovirus and their corresponding high-power magnifications showing PSDs (green).K-L Quantification of the number of PSDs/µm (K) and PSD area (L) in each dendritic branching order of 8-week-old newborn granule neurons in WT and Tau-/- mice. 