CMD1, or SRY-box 9, is a human gene encoded by SOX9. It may also be known as: Transcription factor SOX-9; CMPD1; SRY (sex determining region Y)-box 9. The encoded protein has an amino acid length of 509 and a mass of 56.1 kDa. Other isoforms may exist. Homologs of this gene exist in other organisms, including: Mouse, Fly, Rat, Frog, Chicken.