Fig. 3.

Nucleotide diversity and position of insertions among IRs of the Polypodiales. Horizontal axis indicates the coordinates within the aligned IRs of all Polypodiales. Vertical axis indicate Sliding window analysis (window = 200 b.p.) of p-distances, i.e. the proportion of nucleotide differences per site between sequences calculated by perl script made by Masafumi Nozawa. Colored boxes below marked the coding regions of genes (in the IR of averaged Polypodiales). Blue numbered arrows indicate position of insertions in IR sequences of different fern species (see also Table 2)