Transcriptional corepressor which does not bind directly to DNA and may regulate transcription through recruitment of histone deacetylases to gene promoters (By similarity). Regulates cell adhesion, migration and proliferation (By similarity). Involved in specification of the lateral neural plate border (NPB) (PubMed:28716930). May be required for segmental gene expression during hindbrain development (By similarity). Expressed at the posterior ectoderm except for the dorsal midline in gastrulae (PubMed:28716930). During neurulation, expression diminishes so as to become restricted to the lateral neural plate border (NPB) and neural crest (PubMed:28716930). Morpholino knockdown blocks differentiation of the neural plate border (NPB). Belongs to the Elbow/Noc family. Extended N-terminus.