Figure 3.

The structure of the red abalone egg vitelline envelope receptor for lysin (VERL). There are 353 residues after the last repeat, which contains one ZP domain. Repeats 1 and 2 evolve by positive selection, whereas repeats 3–22 are subjected to concerted evolution. (Figure adapted from Galindo et al. [2002] and reprinted, with permission, from Elsevier © 2002.)