This DNA-binding motif is found in four copies in the pipsqueak protein of Drosophila melanogaster [1]. In pipsqueak this domain binds to GAGA sequence [1].

1: The pipsqueak protein of Drosophila melanogaster binds to GAGA sequences through a novel DNA-binding domain. Lehmann M, Siegmund T, Lintermann KG, Korge G; J Biol Chem 1998;273:28504-28509. PMID:9774480

2: The Drosophila Pipsqueak protein defines a new family of helix-turn-helix DNA-binding proteins. Siegmund T, Lehmann M; Dev Genes Evol 2002;212:152-157. PMID:11976954

3: The Drosophila ribbon gene encodes a nuclear BTB domain protein that promotes epithelial migration and morphogenesis. Shim K, Blake KJ, Jack J, Krasnow MA; Development 2001;128:4923-4933. PMID:11731471