Fold (a.74): Cyclin-like [47953]
Superfamily (a.74.1): Cyclin-like [47954]
Family (a.74.1.1): Cyclin [47955]
Family (a.74.1.2): Transcription factor IIB (TFIIB), core domain [47965]
Family (a.74.1.3): Retinoblastoma tumor suppressor domains [47969]