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The comparison of pairwise nucleotide distances shows that our nuDNA dataset provides a good signal for identifying taxonomic levels , such as species , genera , subtribes , tribes and subfamilies , whereas the mtDNA genome fails because of mtDNA introgression and higher levels of homoplasy .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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