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Phylogenetic tree of 19 species and D. melanogaster selected for the Drosophila BAC resource project. The phylogenetic relationships and approximate divergence times among the Drosophila species in our study were determined from a compilation of prior analyses (Pitnick et al. 1995; Markow and O'Grady 2006; Drosophila 12 Genomes Consortium 2007).
