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We analyzed both mitochondrial (mt-) and nuclear (n) DNAs in a conservation phylogenetic framework to examine deep and shallow histories of the Beaded Lizard (Heloderma horridum) and Gila Monster (H. suspectum) throughout their geographic ranges in North and Central America. Both mtDNA and intron markers clearly partitioned each species. One intron and mtDNA further subdivided H. horridum into its...
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