Mice were sacrificed and brain sections were prepared as previously reported (Deng, 2013 (link)). Primary antibodies used were: rat anti-BrdU (1:250, AbD Serotec CAT# OBT0030CX), mouse anti-NeuN (1:100, Millipore (CHEMICON/Upstate/Linco) CAT# MAB377), and goat anti-DCX (1:250, Santa Cruz Biotechnology CAT# sc-8066). All secondary antibodies were from Jackson ImmunoResearch (Donkey anti-rat IgG Cy3 CAT# 712-165-153, donkey anti-mouse IgG Alexa Fluor 647 CAT# 715-605-151, donkey anti-goat IgG Alexa Fluor 488 CAT# 705-545-147) at 1:250 dilutions. DAPI (Sigma–Aldrich CAT# D9542) was used to stain individual cells.