Coevolution of Interacting Fertilization Proteins
Figure 1
Variation in polymorphism between VERL repeat units and species.
Phylogenies of each segment of VERL sequenced in this study: repeat 1, repeat 2, the last repeat, and the unique C-terminal region. Pink and green branches represent alleles from the pink and green abalone species. Other species and internal branches are shown in black. The repeat unit phylogenies contain a total of 8 species, and the ‘unique’ region has 4 species. While the pink population contains several alleles, the green population contains only two. Repeat unit types 1, 2, and 3–22 evolve independently. Repeats 3–22 evolve by concerted evolution and are represented by the last repeat. Note the deep divergence in the last pink repeat unit relative to other regions of VERL. Black arrowheads indicate the positions of two unrelated, 11-amino acid indels in the pink population.