TEC HOMOLOGY (TH) ADJACENT TO THE PH DOMAIN
The pleckstrin homology (PH) domain is extended in the Btk kinase family by a region designated the TH (Tee homology) domain, which consists of about 80 residues preceding the SH3 domain. The TH domain contains a conserved 27 amino acid stretch designated the Btk motif and a proline-rich region. Sequence similarity was found to a putative Pas GTPase activating protein and a human interferon-gamma