?cl00050: CYCLIN Superfamily (this model, PSSM-Id:320731 is obsolete)
Cyclin box fold. Protein binding domain functioning in cell-cycle and transcription control. Present in cyclins, TFIIB and Retinoblastoma (RB).The cyclins consist of 8 classes of cell cycle regulators that regulate cyclin dependent kinases (CDKs). TFIIB is a transcription factor that binds the TATA box. Cyclins, TFIIB and RB contain 2 copies of the domain.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",