If the production of cyclins is halted during the cell cycle, the cell would remain in the same phase (e.g.- G2) and would not be able to enter into mitosis.
The cyclins are the most important core cell cycle regulators. They are a group of related proteins, as well as there are four basic types found in humans and most other eukaryotes.
Each of the cyclin is connected with a particular phase, transition, or a set of phases in the cell cycle, which helps in driving the events of that particular phase or period.
Cell cycle arrest can occur if cyclins fail to degrade. The levels of the different cyclins vary considerably across the cell cycle. A typical cyclin is present at low levels for most of the cycle, however, it increases strongly at the stage where it is needed.
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