Predicted to enable several functions, including DNA-binding transcription activator activity, RNA polymerase II-specific; aryl hydrocarbon receptor binding activity; and protein heterodimerization activity. Involved in several processes, including negative regulation of apoptotic process; response to estradiol; and response to hypoxia. Located in nucleus. Orthologous to human ARNT2 (aryl hydrocarbon receptor nuclear translocator 2). [provided by Alliance of Genome Resources, Apr 2022]