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 thought to drive cells into G2 phase and thus towards mitosis. Cyclins combine with p34 kinase (cdc2) to form maturation promoting factor (MPF). See also M-phase promoting factor, cyclin-dependent kinase (cdk), cdk inhibitors, cdk activating kinase.
Dictionary of molecular biology. 2004.
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Cyclin D — cyclin D1 Crystal structure of human cyclin D1 (blue/green) in complex with cyclin dependent kinase 4 (yellow/red). Identifiers … Wikipedia
Cyclin A2 — PDB rendering based on 1e9h … Wikipedia
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Cyclin E1 — PDB rendering based on 1w98 … Wikipedia
Cyclin D3 — Identifiers Symbols CCND3; External IDs OMIM: … Wikipedia
Cyclin H — PDB rendering based on 1jkw … Wikipedia
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Cyclin B2 — Identifiers Symbols CCNB2; HsT17299 External IDs OMIM: … Wikipedia
Cyclin T1 — Rendering based on PDB 2PK2 … Wikipedia