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Fig. 5. Properties of the X-box motif in C. elegans. (A) The X-box
consensus sequence obtained from in vivo expression analysis. Nucleotides
marked in red are strongly conserved and important for the proper function of
the motif. (B) Proposed scheme for the difference in expression patterns
observed for xbx genes. Depending on the nucleotide composition of
the X-box, DAF-19 can bind to the motif either in homodimer (driving
expression in many, most or all CSN) or in heterodimer form, interacting
together with some cell-specific factor (driving expression in a subset of
CSN).
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