Consistent with these differences in nucleobase composition, a motif search revealed highly significant enrichment of a 9-b, A-rich, poly-purine motif (at 4163 sites, 10.3 sites per kb, E value 1.7 − 73 ) in positive regulatory fragments (Fig. 4b ).
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Post-transcriptional reprogramming by thousands of mRNA untranslated regions in trypanosomes.
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