We used RNA sequencing data from dissected regions of the human pre- and post-natal brain, available through the BrainSpan project (http://www.brainspan.org/), to explore the regional and developmental expression of the fetal eGenes we identified. FPKM values were log transformed (log2[FPKM+ 0.0001]), clustered using Euclidian distances, and heatmaps were made using ggplot2 [66].