IF staining of week 6 COs for astrocytic markers in the surrounding of VZs (WT: n=6 from 2 batches, KO: n=6 from 2 batches). Scale = 100µm (left) , 50µm (right).   Staining for the DNA damage markers γH2AX and 53BP1 in the nuclei of cells in the VZ of week 6 COs at physiological conditions, together with the pan-radial glia marker SOX2 (WT: n=8 from 3 individual batches, KO: n=12 from 3 individual batches, W-AAV: n=4 from 1 batch). Scale = 50µm (left), 25µm (right).   Quantification of γH2AX (top) and 53BP1 foci (bottom) in the nuclei of cells composing the innermost layer of the VZ, normalized to the total number of nuclei in this layer. The boxplot represents the 1st and 3rd quartile, with its whiskers showing the minimum and maximum points and a central band representing the median. Statistical significance was determined using one-way ANOVA with Tukey's multiple comparisons test (WT: n=8 organoids from 3 batches, KO: n=12 organoids from 3 batches, W-AAV: n=4 from 1 batch).  Data information: n.s (non-significant), *p ≤ 0.05, **p ≤ 0.01, ****p ≤ 0.0001.  