Enables DNA-binding transcription factor activity. Involved in immature B cell differentiation. Acts upstream of or within macrophage differentiation and regulation of transcription, DNA-templated. Predicted to be part of transcription regulator complex. Predicted to be active in nucleus. Is expressed in brain and liver. Orthologous to human SPIB (Spi-B transcription factor). [provided by Alliance of Genome Resources, Apr 2022]