Transcription factor that binds to the promoter and the enhancer regions of target genes. Binds to the enhancer element PRE-I (positive regulatory element-I) of the IL-4 gene (PubMed:7665092). 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. Binds DNA as a dimer and can form stable heterodimers with CEBPA and CEBPB. Interacts with ZNF638; this interaction increases transcriptional activation. Belongs to the bZIP family. C/EBP subfamily.