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A Neighbor Joining phylogeny for the Triturus ND4 haplotypes. The Triturus haplotypes cluster into nine monophyletic mitochondrial DNA lineages, corresponding to species and colored as in Figure 1. Significantly supported branches (≥ 80%, based on a thousand bootstrap replicates) are denoted with an asterisk. The Calotriton asper outgroup used to root the phylogeny is not shown.
