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. 2006 Feb 7;103(7):2237–2242. doi: 10.1073/pnas.0510700103

Fig. 5.

Fig. 5.

Proposed evolutionary history of the somatostatin/UII gene family. According to this scenario, UII- and somatostatin-related peptide genes would result from two rounds of gene duplication; i.e., a tandem duplication followed by a segmental duplication. The latter duplication event may coincide with one of the two whole-genome duplications that took place during vertebrate evolution.