A "winged helix" is a conserved DNA binding domain, specifically the forkhead (IPR001766). The forkhead protein of Drosophila melanogaster is a transcription factor that facilitates terminal development, but not segmental development. It lacks the characteristic zinc finger of other transcription factors and does not possess a homeodomain. The forkhead domain attaches B-DNA as a monomer, but it does not share any similarities with previously identified DNA binding motifs.