Transcription factor that binds to the octamer motif (5'-ATTTGCAT-3') (By similarity). Acts as a transcriptional activator when binding cooperatively with SOX4, SOX11, or SOX12 to gene promoters (By similarity). Acts as a transcriptional repressor of myelin-specific genes (PubMed:1975954). Neural tissues and testis. Transiently increased in rapidly dividing Schwann cells in response to sciatic nerve transection 2 days post-injury. Belongs to the POU transcription factor family. Class-3 subfamily.