CJun is an alias for the gene, Jun proto-oncogene, in humans. Other names include: Transcription factor AP-1; Activator protein 1; AP1; Proto-oncogene c-Jun; V-jun avian sarcoma virus 17 oncogene homolog; c-Jun. The encoded protein has an amino acid length of 331 and a mass of 35.7 kDa. CJun is a member of the BZIP family, Jun subfamily. This gene shares homology with other species, including: Zebrafish, Frog.