Week 15 and week 24 COs stained for the astrocytic and radial glia marker GFAP, and the astrocyte-specific marker S100β (WT W15: n=9 from 3 batches, KO W15: n=16 from 3 batches, W-AAV W15: n=4 organoids from 1 batch. WT W24: n=10 from 4 batches, KO W24: n=9 from 3 batches, W-AAV W24: n=4 from 1 batch). Scale = 100µm 