Homeobox protein Hox-B9, Hox-2E, Hox-2.5, HOXB9, HOX2E,,HOX B9
Recognizes the ribosomal RNA gene promoter and activates transcription mediated by RNA polymerase I (Pol I) through cooperative interactions with the transcription factor SL1/TIF-IB complex. It binds specifically to the upstream control element and can activate Pol I promoter escape.
