library_construction_protocol: Cortices were dissected from Olig2-Cre, RbpjF/F, H2B-GFP F/+ mice (n=2) and littermate controls (Olig2-Cre, Rbpj F/+, H2B-GFP F/+, n=3) at P2. Tissues were dissociated into single cells and fluorescent cells were sorted and collected by flow cytometry. The total mRNAs were extracted and performed quality control using Qubit 2.0 Fluorometer, cDNAs were generated and amplified using the SMART-Seq HT kit (Cat, 634437, Takara) according to the manufacturer's protocol followed by quality control using Agilent2100. The libraries were generated using the Ovation Ultralow Library System V2 liabrary kit (0347, Nugen)