Blogger PZ Myers at Pharyngula goes into great detail about master control genes. He covers cis-regulatory transcription factor binding sites, feedback loops of these genes, and an overall detailed description of how Pax-6, a master control gene that initiates development of the eye, works in developing embryos when turned on and different times and places. His diagrams and photos help to make it all digestible.
The Maze of Master Control Genes
Sep 24, 2007