The rabbit anti-ANK3 (Ankyrin-G; sc-28561), the goat anti-SOX1 (sc-17318) and the HRP-conjugated secondary antibodies were from Santa Cruz Biotechnology (Santa Cruz, CA). The chicken anti-GFP (A10262) and rat anti-mCherry (M11217) were from Life Technologies. The mouse anti-PSD95 (Clone K28/43, 75-028) was from NeuroMab, the rabbit anti-SOX2 (ab59776) from Abcam (Cambridge, MA), and the rabbit anti-Tuj1 (PRB-435P) from Covance (Richmond, CA). The rabbit anti-CACNB3 was purchased from LifeSpan BioSciences (Seattle, WA). The mouse monoclonals anti-Synaptophysin (S5768) and the anti-β-actin (A1978) were from Sigma. Finally, the rabbit anti-Musashi (AB5977) was from Millipore and the mouse anti-Synapsin 1 (106 001) as well as guinea pig anti-MAP2 (188 004) were purchased from Synaptic Systems (Gottingen, Germany).