A new study published in the journal Genes and Development has revealed how genes involved in circadian clock in humans control them in a proper rhythm within 24-hour period. This study reveals the actual involvement of genes almost 16 years after scientists after their discovery. According to the researchers it was known that there are four proteins involved in maintaining the circadian rhythm but how exactly they reset the cells was not known. The findings of this study gives a better idea about how the genes function to set the cells rhythm. How is the circadian cycle controlled by genes?