CBX5 encodes the human gene, Chromobox 5. It may also be known as: Chromobox protein homolog 5; Antigen p25; Heterochromatin protein 1 homolog alpha; HP1 alpha; HP1 alpha homolog (Drosophila); HEL25; HP1A; chromobox homolog 5. The encoded protein has an amino acid length of 191 and a mass of 22.2 kDa. Other isoforms may exist. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.