Transcription factor that binds to the promoter and the enhancer regions of target genes (PubMed:21602272). Binds to the promoter and the enhancer of the immunoglobulin heavy chain (PubMed:2121606). Binds to GPE1, a cis-acting element in the G-CSF gene promoter (PubMed:1709121). 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 alpha-1-fetoprotein gene (By similarity). Binds DNA as a dimer and can form stable heterodimers with CEBPA (PubMed:2121606). Can form stable heterodimers with CEBPB (By similarity). Interacts with ZNF638; this interaction increases transcriptional activation (PubMed:21602272). Ubiquitous. Belongs to the bZIP family. C/EBP subfamily.