Fig. 4. (A) Putative transcription factor binding sites within the MRR. The MRR is a 785 bp NdeI fragment ranging from –1619 bp to –834 bp from the start of transcription. Homology searches identified HBX1, 2 and 3 (blue shading) as being putative binding sites for homeodomain containing transcription factors. A TCF consensus site is shaded green. (B) Comparison of HBX2 with the consensus binding site for Xvent-2 (Trindade et al., 1999). Grey shading highlights differences from consensus sequence.