Transcriptional regulator. Recognizes and binds to the DNA sequence 5'-GCGGGGGCG-3' (GSG). Activates the transcription of target genes whose products are required for mitogenesis and differentiation (By similarity). By PHA/PMA or by serum. Belongs to the EGR C2H2-type zinc-finger protein family. It is uncertain whether Met-1 or Met-104 is the initiator. Some orthologous sequences cannot be extended. Truncated N-terminus. Truncated N-terminus.