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Divergence of NBCe1, NBCe2, and “AE4” in vertebrates. The unrooted phylogram displays the relatedness, at the level of protein sequence, among the transmembrane domains of NBCe1, NBCe2, and “AE4” for zebrafish (Danio rerio), frogs (Xenopus tropicalis), fowl (Gallus gallus), mice (Mus musculus), and humans. The phylogram was generated using ClustalW (183) and TreeView (704). The GenBank protein accession numbers for each transporter are provided in Appendix IV.
