IF staining in week 15 COs validating the decreased levels of the deep-layer cortical markers CTIP2 (BCL11B) and TBR1, and superficial-layer marker SATB2 (WT: n=3, KO: n=4, W-AAV: n=4). Scale = 50µm.   Quantification of the cortical markers seen in G, normalized to the total number of nuclei. Y-axis indicates the fold change compared to the average of the WT COs. 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=9 from 3 batches, KO: n=16 from 3 batches, W-AAV: n=4 organoids from 1 batch).   Data information: *p ≤ 0.05, **p ≤ 0.01, ***p ≤ 0.001, ****p ≤ 0.0001. 