Transcription factor that binds to the promoter and the enhancer regions of target genes. Binds to the promoter and the enhancer of the alpha-1-fetoprotein gene (PubMed:1377818). Binds to the enhancer element PRE-I (positive regulatory element-I) of the IL-4 gene (By similarity). Binds to the promoter and the enhancer of the immunoglobulin heavy chain. Binds to GPE1, a cis-acting element in the G-CSF gene promoter (By similarity). Binds DNA as a dimer and can form stable heterodimers with CEBPA and CEBPB (PubMed:1377818). Interacts with ZNF638; this interaction increases transcriptional activation (By similarity). Belongs to the bZIP family. C/EBP subfamily.