Only in recent years has science determined that developmental regulation proceeds through a sequential activation of series of regulatory switches that, in turn, activate networks of other genes. (fossilmuseum.net)
What makes a horse different from a tiger, a mouse and a walrus is the set of regulatory switches in the DNA that dictate where, when and for how long those genes are active. (scientificamerican.com)
The researchers discovered that hundreds of gene regulatory switches known as enhancers are used differently in the two species. (sciencenews.org)