TROB2, or Transducer of ERBB2, 2, is a human gene encoded by TOB2. It may also be known as: Protein Tob2; Transducer of erbB-2 2; Protein Tob4; TOB4; TOBL. The encoded protein has an amino acid length of 344 and a mass of 36.6 kDa. Other isoforms may exist. TROB2 is a member of the BTG family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.