Figure 2.
Distribution of (base substitution-only) polymorphisms, occurring in 20-bp bins, across the 2.28-kb IGS region. The approximate locations of the 5S rRNA gene, the RFB site, E-pro, and rARS are shown, along with the number of polymorphisms (in parentheses) identified in each cis-acting functional element. A trend line (dotted line) has also been added to show the polymorphism distribution if the 149 detected sites were evenly distributed across this region (i.e., at a frequency of ∼1.3 sites per 20 nucleotides).
