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Unrooted distance neighbor-joining tree showing the phylogeny of carboxyl/cholinesterases (CCEs) from the genome of Culex pipiens quinquefasciatus in relation to CCEs from Drosophila melanogaster (in italics). CCEs of C. p. quinquefasciatus undetected in DGE libraries are shown in bold. The percentage of bootstrap confidence values greater than 70% (1000 replicates) is shown at the nodes. The functional assignment of clades follows the new system proposed by Oakeshott et al. [9].
