THYROXINE BINDING GLOBULIN, or Serpin peptidase inhibitor, clade A (alpha-1 antiproteinase, antitrypsin), member 7, is a human gene encoded by SERPINA7. It may also be known as: Thyroxine-binding globulin; T4-binding globulin; Serpin A7; thyroxin-binding globulin; TBG. The encoded protein has an amino acid length of 415 and a mass of 46.3 kDa. Other isoforms may exist. THYROXINE BINDING GLOBULIN is a member of the Serpin family. Homologs of this gene exist in other organisms, including: Mouse, Rat.