Promoter clustering of QTC 3 genes obtained from analyses the serum response data. [A] Subcluster 3A (green box) including the E2F1 gene (red box). [B] The organization of the promoters of the cluster 3A genes. For each gene the 3 kb upstream and 1 kb downstream from the TSS is shown and the positions of significant transcription factor binding sites indicated by a color code. Boxes, exons; green arrows, transcription start sites for the investigated gene; red arrows, transcription start sites of additional genes; red bars, exons of additional genes.