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Figure 1-3.
A Phylogenetic tree of medaka and its relatives, based on nuclear and mitochondrial DNA sequences (Takehana et al., 2005). Numbers above and below internal branches indicate bootstrap values and decay indices, respectively. Medaka fishes are divided into three monophyletic groups: javanicus, latipes, and celebenesis species. Each species group corresponds to the monoarmed, biarmed, and fused chromosome groups, respectively, as previously classified by karyological analysis.