The ELISA kits listed below target BTK, the symbol for the human gene, Bruton tyrosine kinase, and a member of the Protein kinase superfamily, Tyr protein kinase family, TEC subfamily. The protein has an enzyme classification of protein-tyrosine kinase. The protein encoded by BTK has a predicted amino acid length of 659, a mass of 76.3 kDa, and a cytoplasmic, nuclear and membrane subcellular localization. There are currently 2 reported isoforms. Pathologic involvement is reported in X-linked agammaglobulinemia. BTK may also be known by the following names: truncated Bruton agammaglobulinemia tyrosine kinase, Bruton's tyrosine kinase, Bruton agammaglobulinemia tyrosine kinase, B-cell progenitor kinase, and tyrosine-protein kinase BTK, and tyrosine-protein kinase BTK isoform (lacking exon 14). Orthologs of the gene, including human, mouse, rat, bovine, chicken, primate, guinea pig, fish, and other mammalian are available targets of several ELISA kits.