What is correct regarding the following paragraph?
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A particular cyclin called cyclin E forms a complex with a cyclin-dependent kinase called Cdk 2. This complex is important for the progression of the cell from G1 into the S phase of the cell cycle.
The amount of Cyclin E is highest during G1. This is simply because Cyclin E is the protein responsible for the progression of the G1 phase. Without the aid of Cyclin E1 and E2, the cell cannot move on to the S phase.