Predicted to enable several functions, including DNA-binding transcription repressor activity, RNA polymerase II-specific; histone deacetylase binding activity; and identical protein binding activity. Involved in Notch signaling pathway and heart development. Located in nucleus. Orthologous to human HEY2 (hes related family bHLH transcription factor with YRPW motif 2). [provided by Alliance of Genome Resources, Apr 2022]