Figure 3

Nucleotide variability distribution. A) Distribution of nucleotide variability along the ^3'IGS-ETS sequences in Bacillus by sliding window analysis (window size, 60 bp; step size, 10). The vertical dashed line indicates the IGS/ETS boundary. Above, the structure of ^3'IGS-ETS sequence and schematic drawing of functional elements are reported: arrow and solid blocks indicate putative gene promoter and Bag388, respectively. B) Distribution of nucleotide variability along the Bag530 monomers using sliding window analysis (window size, 30 bp; step size, 15). One (*) and two (**) stars mark the position of the putative promoter and the palindromic sequences, respectively, which occur in each of the Bag530 repeats. Above, the Bag530 monomer structure has been represented. In both A and B sections, nucleotide positions (midpoint of sliding window) and nucleotide diversity are reported on the X and Y axes, respectively; average variability of Pi is shown by a solid line, dashed lines represent average variability ± 2 SD (standard deviation).