Clock gears

State-of-the-art research on circadian rhythms began with a seminal finding of “clock genes” that are common to human beings and other mammals. The field since then has expanded into a rich and diverse interdisciplinary academic field that deals with both basic sciences and clinical interrogations of daily rhythms in physiology. There are still a number of mysteries in the molecular clock gears, which would reveal as yet undeciphered molecular links between daily physiologies and circadian clock.
See: Doi et al PNAS, 2001; Doi et al Curr Biol, 2004; Doi et al Cell, 2006; Doi et al Nature Neurosci, 2006; Fustin et al Cell, 2013