Figure 5.
Organization of the intergenic spacer (IGS) region of the 12 Drosophila species. All subrepeats are represented as rounded boxes. The nonrepeated regions adjacent to the upstream 28S gene are shown as horizontal lines. Asterisks indicate sequence identity between adjacent regions of the IGS. The n subscript indicates that each subrepeat is duplicated a variable number of times in the different rDNA units of each species, while the m subscript indicates a higher ordered repeat. An example of the nonrepeated and subrepeat sequences of each species can be found in Supplemental Table 2.
