This region of sequence similarity is found up to six times in a variety of proteins including GTF2I. It has been suggested that this may be a DNA binding domain [1,2].

1: Identification of a novel slow-muscle-fiber enhancer binding protein, MusTRD1. O'Mahoney JV, Guven KL, Lin J, Joya JE, Robinson CS, Wade RP, Hardeman EC; Mol Cell Biol 1998;18:6641-6652. PMID:9774679

2: Identification of a putative transcription factor gene (WBSCR11) that is commonly deleted in Williams-Beuren syndrome. Osborne LR, Campbell T, Daradich A, Scherer SW, Tsui LC; Genomics 1999;57:279-284. PMID:10198167