Predicted to enable RNA polymerase II-specific DNA-binding transcription factor binding activity and transcription regulator inhibitor activity. Predicted to be involved in cell differentiation; circadian regulation of gene expression; and negative regulation of transcription by RNA polymerase II. Predicted to act upstream of or within several processes, including gland morphogenesis; negative regulation of cell differentiation; and neurogenesis. Predicted to be located in cytoplasm and nucleoplasm. Predicted to be active in nucleus. Orthologous to human ID4 (inhibitor of DNA binding 4, HLH protein). [provided by Alliance of Genome Resources, Apr 2022]