Detail of the subtype B LTR region.

Schematic representation of the LTR region from -356 to +55 showing the cellular DNA binding proteins that have been described to interact with the prototype subtype B. The modulator region is placed upstream of the enhancer (which contains two NFkB motifs). The core promoter encompasses the three Sp1 sites and the TATA box. The transcription start point is indicated by +1.