regulatory elements in the predicted promoters of merozoite- and tachyzoite-specific genes. (A) Enriched six-base motifs were identified within the predicted promoters of merozoite- and tachyzoite-specific genes. Listed for both stages are the five most significantly enriched motifs, their occurrence, expected occurrence, and occurrence significance. Asterisks indicate motifs overlapping with the putative cis regulatory elements for promoters of merozoite- and tachyzoite-specific genes, shown in (B) and (C), respectively. (D) Percentage of promoters from merozoite- or tachyzoite-specific genes that contain either the GAAGAAA or GAGACGC putative cis elements. (E) Distribution of the GAGACGC cis element (blue) within the promoters of the fifteen most tachyzoite-specific genes. The predicted promoters correspond to the 500 bp genomic region directly upstream of the transcriptional start site, indicated by an arrow.