Genome-wide expression map at 1 Mb resolution for E18 and P7. Each 1 Mb interval is represented by a horizontal box, with color ranging from black to green. A box with black color means that there was no exon in this given interval. The brighter the green color, the higher the exon content (percentage) this given interval possesses. The scale at the bottom of the map illustrates color representation of the exon percentage of the region. Red square at the left side of the chromosome represents the detected number of RNA-seq reads for the given region in E18 stage, while the blue square at the right side represents the detected number of RNA-seq reads in P7 stage. Expression level is data size normalized. Scale for expression level is at the bottom of the map.