Concept
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Regulator Molecules of the Cell Cycle
Cyclin Concentrations at Checkpoints
The concentrations of cyclin proteins change throughout the cell cycle. There is a direct correlation between cyclin accumulation and the three major cell cycle checkpoints. Also, note the sharp decline of cyclin levels following each checkpoint (the transition between phases of the cell cycle) as cyclin is degraded by cytoplasmic enzymes.
Source
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"OpenStax College, Control of the Cell Cycle. October 16, 2013."
http://cnx.org/content/m44466/latest/Figure_10_03_02.jpg
OpenStax CNX
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