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E-box variants that peak in Drosophila and human promoters. (a-d) The number of occurrences of (a) CACGTG,(b) CAGCTG, (c) RCACGTGY and (d) YCACGTGR in each 20 bp bin for Drosophila (dotted black), human (UCSC; solid red), and human (DBTSS; dashed blue) promoters.
