CP1, or SATB homeobox 2, is a human gene encoded by SATB2. It may also be known as: DNA-binding protein SATB2; Special AT-rich sequence-binding protein 2; GLSS. The encoded protein has an amino acid length of 733 and a mass of 82.6 kDa. Other isoforms may exist. CP1 is a member of the CUT homeobox family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.