Transcription factor that binds to the octamer motif (5'-ATTTGCAT-3') (PubMed:1979677, PubMed:1976514). Acts as a transcriptional activator when binding cooperatively with SOX4, SOX11, or SOX12 to gene promoters (PubMed:18505825). Acts as a transcriptional repressor of myelin-specific genes (By similarity). Expressed in embryonal stem cells and in the developing brain (PubMed:1979677). Down-regulated in embryonic stem cells upon differentiation (PubMed:1979677). Expressed in the sciatic nerves at postnatal days P6 to P12 (PubMed:10068633). Belongs to the POU transcription factor family. Class-3 subfamily.