Fig. 7

Sequence variation in the palindrome arms. a Density of fixed differences between S. purpurea and S. suchowensis per 100 bp. b Density of paralogous sequence variants (PSVs, differences among the four palindrome arms) in S. purpurea and S. suchowensis. c Relative depth of Illumina sequence reads aligned to a reference sequence of one arm of the S. purpurea palindrome, where 2N represents the expected depth of read alignment across the whole genome. The gray shaded area represents a segment of the palindrome that is enriched for interspecific fixed variants, but depleted in PSVs, providing strong evidence for differential gene conversion in the two lineages