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The tree was generated with the TREEVIEW program (Page, 1996) using sequence alignment produced by ClustalW at http://www.ebi.ac.uk/clustalw/#. The bar indicates 0.1 amino-acid substitutions per site. Human protein sequences were used for the alignment. Each sequence was obtained by input individual gene name in the UniGene web site: http://www.ncbi.nlm.nih.gov/UniGene/
