Sequence-specific DNA-binding protein that interacts with enhancer elements to regulate transcription of selected genes (By similarity). Required for neuroblast and epidermal morphogenesis, perhaps acting in cooperation with transcription factor aptf-4 (PubMed:27176626). Binds DNA as a dimer. Localized to both cytoplasm and nucleus in most cells, but significant nuclear enrichment in neuroblasts and epidermal cells in AB lineage during ventral cleft closure and in epidermal cells in C lineage preceding dorsal intercalation. Belongs to the AP-2 family.