Cmyb, or V-myb avian myeloblastosis viral oncogene homolog, is a human gene encoded by MYB. It may also be known as: Transcriptional activator Myb; Proto-oncogene c-Myb; Cmyb; c-myb; c-myb_CDS; efg. The encoded protein has an amino acid length of 640 and a mass of 72.3 kDa. Other isoforms may exist. Homologs of this gene exist in other organisms, including: Zebrafish, Frog.