A cyclin-dependent kinase complex (abbreviated cdkc, also called cyclin-CDK) is a protein complex formed by the association of cyclin with cyclin-dependent kinase. These complexes are able to phosphorylate other compounds under consumption of ATP, and are thereby involved in the regulation of the cell cycle. Depending on the type of cyclin attached to CDK, it has a different function. These serve as markers in each phase which are integral for the correct sequence of events, as well as facilitating the transition to the next phase.
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“In ordinary speech the words perception and sensation tend to be used interchangeably, but the psychologist distinguishes. Sensations are the items of consciousness—a color, a weight, a texture—that we tend to think of as simple and single. Perceptions are complex affairs that embrace sensation together with other, associated or revived contents of the mind, including emotions.”
—Jacques Barzun (b. 1907)