A number of ELISA Kits are available that target transducer of ErbB-2.1, an alias of the protein, transducer of ERBB2, 1. The human protein, encoded by the gene TOB1, is a member of the BTG family. The protein's cellular localization is indicated to be cytoplasmic and nuclear. Additional synonyms or past names for this protein may include: APRO5, APRO6, PIG49, TOB, TROB, TROB1. Homology is conserved in other species, such as Mouse, Rat, Fly, Frog.