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A model for DPE-specific activation of transcription by Caudal. This model depicts a hypothetical segment of a regulatory network that comprises specific connections between activators and core promoter motifs. Caudal is a DPE-specific activator. TATA-specific activators might also exist. The ability of Caudal to function with a TATA box is further reduced by the presence of a BREu motif, which is located immediately upstream of a subset of TATA elements.
