
Schematic of intergenic insertions. (Left column) The number of Tf insertions found in intergenic regions between tandem, divergent, and convergent genes. (Center column) Number of insertions into these regions expected based on the size and number of intergenic sequences belonging to each class. (Right column) Number of insertions into these regions expected based on the number of RNA polymerase II promoters present in each type of intergenic sequence.











