Genomic structure and evolutionary conservation of Six3 and Six3OS. Schematic drawing showing conservation of human and mouse Six3 and Six3OS genomic structure. Light grey bars show where the predominant Six3OS mouse and human forms overlap. Dark grey bars indicate where mouse Six3OS is adjacent to conserved regions. Conservation is plotted using the PhastCons program . An asterisk indicates the cRNA probes that were hybridized to the protein microarray in Figure 6.