J-L Quantification of Tbr1+ (J), Ctip2+ (K) and Satb2+ (L) neurons in the CP in a 100 µm-wide field of E18.5 WT (white) and 11B (black) mouse neocortex at the position where cortical thickness was measured (A, red lines). Data are the mean of 7 (WT) and 8-12 (11B) littermate embryos, which were derived from 4 separate litters. Error bars indicate SD. Two-way ANOVA, followed by Bonferroni's multiple comparisons test (B-D); two-tailed unpaired Student's t-test P = 0.0085 (J); P = 0.0093 (K); P = 0.0157 (L).  