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The distribution of 8 'human specific' motifs in Drosophila and human promoters. (a-h) The number of occurrences of each previously identified [11] human specific motif in each 20 bp bin for Drosophila (dotted black), human (UCSC; solid red) and human (DBTSS; dashed blue) promoters. The number of occurrences of each element has been normalized, based on a dataset of 10,000 promoters, to compensate for the different sizes of the datasets.
