Dead zones in circadian clocks

Circadian clocks of organisms respond to light signals during night but do not respond in daytime. The time window where circadian clocks are insensitive to light signals is referred to as the ‘dead zone’. Researchers have proposed a mechanism for the daytime dead zone. They report that saturation of a single biochemical reaction in the gene regulatory network that controls circadian oscillations can create a daytime dead zone in different species.
Source: Science Daily,