This domain is found in Drosophila Headcase protein and the human Headcase protein homolog. In humans, it may have a role in some cancers [1].

1: Isolation and characterization of the human gene homologous to the Drosophila headcase (hdc) gene in chromosome bands 6q23-q24, a region of common deletion in human pancreatic cancer. Makino N, Yamato T, Inoue H, Furukawa T, Abe T, Yokoyama T, Yatsuoka T, Fukushige S, Orikasa S, Takahashi T, Horii A; DNA Seq. 2001;11:547-553. PMID:11696983