Locations of the TSSs identified for the three genes. Genome browser images showing all the TSSs identified in this study for FOXG1 (panels a and d), MECP2 (panels b and e) and CDKL5 (panels c and f) in mouse (panels a,b and c) and humans (panels d, e and f). In each panel the top two tracks show RefSeq genes and mRNAs from Genbank. The third track shows FANTOM5 TSS and the bottom track shows CpG islands. Red arrows mark the key TSSs for each gene. We found 6 TSSs for Foxg1 in mouse (panel a) and 8 TSSs in humans (panel d). Novel TSSs are identified by asterisks. We also found a CD14 specific intronic TSS p5 for MECP2 in human cells.