Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A class of proteins that fluctuate in concentration at specific points during the cell cycle and that regulate the cycle by binding to a kinase.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biochemistry Any of a group of proteins whose presence in a cell varies through its cycle, and that regulates this cycle by forming a complex with kinase

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