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Figure 2 | BMC Evolutionary Biology

Figure 2

From: The vertebrate ancestral repertoire of visual opsins, transducin alpha subunits and oxytocin/vasopressin receptors was established by duplication of their shared genomic region in the two rounds of early vertebrate genome duplications

Figure 2

Phylogenetic relationships between oxytocin and vasopressin receptor subtype genes. Tree topology inferred with the phylogenetic maximum likelihood method from an amino acid sequence alignment, supported by a non-parametric bootstrap analysis with 100 replicates. Arrowheads indicate nodes with bootstrap values lower than 50% that were not considered informative. Rooted with the common octopus OTR, CTR1 and CTR2 sequences (not shown). See Additional file 2: Figures S5 and S6 for full trees with all bootstrap values and root, including a neighbor joining topology. Sequence names and scale as in as in Figure 1. Teleost fish duplicates are indicated by brackets. The V2C sequences do not form a well-supported clade; this is also indicated with a bracket. Approved gene names are used for human, mouse and chicken genes, otherwise subtype names are used. Some of the sequence predictions used to make the tree are fragments and do not span the whole length of the alignment (see Additional file 1).

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