Can act as both a transcriptional repressor and corepressor. Represses the expression of genes involved in neural development and preferentially binds palindromic sequence 5'-CCAATTGG-3' to mediate transcriptional repression (PubMed:25561495, PubMed:23468431). Acts as a corepressor for suppressor of hairless (Su(H)) and inhibits Notch signaling during peripheral nervous system development (PubMed:21765394, PubMed:25561495). Homodimer. Interacts (via BEN domain) with Su(H). Interacts with Cp190. Initially expressed ubiquitously in the early embryo and later throughout the developing ectoderm but becomes highly restricted to the developing CNS and PNS. Peak expression seen at the blastoderm stage (2-4 hours) (at protein level). The BEN domain mediates DNA-binding.