Transcription factor that binds to the immunoglobulin enchancer Mu-E5/KE5-motif. Involved in the initiation of neuronal differentiation. Activates transcription by binding to the E box(5'-CANNTG-3'). Binds to the E-box present in the somatostatin receptor 2 initiator element(SSTR2-INR) to activate transcription(By similarity). Preferentially binds to either 5'-ACANNTGT-3' or 5'-CCANNTGG-3'.