Cortical neurogenesis defects of Casc3 compound mutants due to developmental delay. (A–P) E14.5 (A–L) and E13.5 (M–P) coronal sections of embryonic brains from control (A–D and M–P), Casc3RRU345/RRU345 (E–H), and Casc3RRU345/Null (I–L), stained for PAX6+ radial glia (A,E,I,M), TBR2+ intermediate progenitors (B,F,J,N), TUJ1+ neurons (C,G,K,O), and CC3+ cells (D,H,L,P). Dotted lines denote boundaries of dorsal cortices. (Q–S) Quantification of dorsal cortical thickness (Q) percentage of all cells which are TBR2+ within a 200 µm column (R), and thickness of TUJ1+ layer relative to cortex (S) for indicated genotypes. For cortical thickness, the value of control brains was set to 1.0. (Q–S) Two-tailed Student's t-test, (*) P < 0.05, (n.s.) not significant. Error bars, SD. n = 3–4 biological replicates each. Scale bars: A–P, 50 µm.