Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The mammalian circadian clock. (a) The mechanism of the mammalian molecular clock illustrating the feedback loop that maintains 24-h oscillations of BMAL1-CLOCK/NPAS2 and PER-CRY expression. (b) Illustration of antiphase circadian oscillations of BMAL1-CLOCK/NPAS2 and PER-CRY expression. (c) Schematic illustrating the relationship between the core clock and clock-controlled genes.
