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Figure 2 | BMC Evolutionary Biology

Figure 2

From: Intron-loss evolution of hatching enzyme genes in Teleostei

Figure 2

Evolutionary pathway of teleostean hatching enzyme genes. Duplication of hatching enzyme gene occurred in the ancestor of clupeocephalans (black square), and clupeocephalans possessed clade I genes (red line) and clade II genes (blue line). Clade II gene-loss occurred in the ancestor of otophysans. Intron-loss/insertion events are indicated at the lineage shown either with red (clade I genes) and blue (clade II genes) triangles. Resultant exon-intron structures are shown at the right with the same colors. The cladogram of teleostean relationships is based on the molecular phylogenetic relationships estimated using whole mitochondrial DNA sequences with some modifications [24–27].

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