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Fig. 3 | BMC Evolutionary Biology

Fig. 3

From: Molecular evolution of mammalian genes with epistatic interactions in fertilization

Fig. 3

Episodes of diversifying positive selection on two genes that encode egg coat proteins that bind sperm, including Zp3 and Zp2 (in Glires), and ZP2 (in Primates). Both genes in both taxa are known to be expressed in the egg coat and sensitive to sexual selection. Note that no positively selected sites were identified in ZP2 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 ZP3 in Primates (not shown)

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