Fig. 6

Episodes of diversifying positive selection on three genes that encode gamete-fusion proteins, including Juno and Izumo1 (in Glires), and IZUMO1 (in Primates). Both genes are known or expected to be expressed in gametes and sensitive to sexual selection. Note that no positively selected lineages could be identified in Juno (in Glires), and no positively selected sites could be identified in IZUMO1 (in Primates). Branches and sites under positive selection, and protein coding domain types, are shown as in Fig. 2. No episodes of diversifying selection were found in JUNO in Primates (not shown)