Members of this family of DNA-binding domains are found the transcription factor CEP-1. They adopt a beta sandwich structure, with nine strands in two beta-sheets, in a Greek-key topology [1].

1: Structural differences in the DNA binding domains of human p53 and its C. elegans ortholog Cep-1. Huyen Y, Jeffrey PD, Derry WB, Rothman JH, Pavletich NP, Stavridi ES, Halazonetis TD; Structure. 2004;12:1237-1243. PMID:15242600