Definition of Cyclin
1. any of a group of proteins that control the cell cycle [n -S]
Medical Definition of Cyclin
1.
Proteins (A and B forms known) whose levels in a cell varies markedly during the cell cycle, rising steadily until mitosis, then falling abruptly to zero. As cyclins reach a threshold level, they are though to drive cells into G2 phase and thus to mitosis. Cyclins combine with p34 kinase (cdc2) to form maturation-promoting factor (MPF).
See: M phase promoting factor.
This entry appears with permission from the Dictionary of Cell and Molecular Biology
(11 Mar 2008)
Lexicographical Neighbors of Cyclin
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