Cyclin K is a human gene encoded by the symbol, CCNK. It may also be known as: Cyclin-K; CPR4. The encoded protein has an amino acid length of 580 and a mass of 64.2 kDa. Cyclin K is a member of the Cyclin family, Cyclin C subfamily. Homologs of this gene exist in other organisms, including: Fly, Mouse, Rat, Zebrafish, Frog, Nematode, Chicken.