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Figure 1 | BMC Evolutionary Biology

Figure 1

From: Reevaluating Emx gene phylogeny: homopolymeric amino acid tracts as a potential factor obscuring orthology signals in cyclostome genes

Figure 1

Alternative scenarios for timing of Emx gene duplication. (a) Scenario supporting the common Emx duplication before the cyclostome-gnathostome split. In this scenario, the establishment of the nested Emx expression could have occurred once before the cyclostome-gnathostome split just after the gene duplication. (b) Scenario supporting independent Emx duplications in both of the lamprey and gnathostome lineages. In this scenario, the nested Emx gene expression (see Background) is assumed to have been established independently in the two lineages, as a result of convergence. (c) Nested expression patterns of Emx genes in the embryonic brains of sea lamprey and mouse. The ranges of the gene expressions including the pallium (pal) in the telencephalon (tel) along the anteroposterior axis are indicated with the lengths of the thickened vertical bars.

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