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Number of BSs of 19 TFs (see text) on the 500 bp region upstream of 13686 genes. A DNA sequence was considered to be a BS if its score was higher than Tmax. The BS were counted separately for on (blue) and off Alu (red) 7 appearance. For 7 out of 19 TFs the majority of the putative BSs reside on Alu. (A) developmental TFs (B) other TFs.
