Biological rhythms are ubiquitous in nature, from the beating of the heart to the rhythms of flowering plants. This rhythmicity is in some instances determined by the oscillations in the activity of cellular proteins, which mark the rhythms of the processes they control. The two main cellular oscillators are the so-called circadian clock and the cell cycle. The circadian clock is responsible for generating the oscillations of biological processes in coordination with the day and night cycle and its associated changes in light and temperature. In turn, the cell cycle is responsible for the division and growth of cells. If the cell cycle does not work properly, the effects on organisms are very dramatic The most well-known is the development of cancer. Therefore, the cell cycle must be very tightly regulated to avoid a possible malfunction.