Refer to the figure showing cyclin binding to Cdk. 
The regulation carried out by cyclins and Cdk's varies across the cell cycle.What is the primary reason for this variation?
Definitions:
AGI Amounts
AGI Amounts, or Adjusted Gross Income Amounts, represent an individual's total gross income minus specific deductions, used to determine how much of their income is taxable.
American Opportunity Tax
A credit designed to help students with costs of higher education by reducing taxes or increasing a tax refund.
Credit
A direct reduction of tax owed, not just a reduction of taxable income, which can also refer to borrowing capacity in financial contexts.
Credit for the Elderly
A tax credit available to taxpayers aged 65 and older, aimed at reducing the tax liability for qualified individuals.
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