Enables RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Involved in enucleate erythrocyte differentiation; natural killer cell mediated cytotoxicity; and regulation of gene expression. Acts upstream of or within B cell differentiation and mRNA metabolic process. Located in nucleus. Is expressed in several structures, including blood; central nervous system; genitourinary system; retina; and yolk sac. Orthologous to human CEBPG (CCAAT enhancer binding protein gamma). [provided by Alliance of Genome Resources, Apr 2022]