Specific patterns of top-scoring motifs in the promoter sequence of genes in either the contractile (top), energy generation (center), or protein translation (bottom) modules. Gray bars represent 435 bp of promoter and 5' UTR sequence (-400 → +35 bp). Colored boxes indicate occurrences of each motif using the color patterns shown in the legend (bottom). Occurrences are drawn to scale, and overlapping sites are drawn at half-height to ease viewing. The scale bar is given on the top, with numbers relative to the transcription start site (gray dashed line, +1 bp). Colored lines above the scale indicate the position range used for each motif. Note that the pyrimidine-rich sequence (black) is directly adjacent to the transcription start site in most genes of the translation module, but not in contractile or energy generation genes. Also note the complete absence of the CCGGAA (green) motif in the contractile promoter sequences. Instead, contractile promoters have a high proportion of a different G-rich motif (GGGRWGGG, red), occurring between -400 bp and the transcription start site.