Position of the c-Myb binding motif in the promoter sequences of v-ErbA target genes. The position of the c-Myb binding motif (CAGTTA) is represented as grey boxes in the promoter regions of v-ErbA repressed genes containing at least one such motif (i.e. 64% of the v-ErbA repressed genes identified by SAGE). The 4 kb sequence flanking the transcription start site (TSS, shown at position 3000) are displayed. The following parameters were used for extracting this motif: minimal motif size: 5; maximum number of examples in the negative (v-ErbA activated) set: 5; minimum number of examples in the positive (v-ErbA repressed) set: 20. Arrowheads indicate the genes that have been validated as v-ErbA repressed genes by real time PCR.