29920
Previous attempts to resolve the ambystomatid species tree using allozymic , morphological , and mitochondrial sequence data have yielded different estimates , making it unclear which data source best approximates ambystomatid phylogeny and which ones yield phylogenetically inaccurate reconstructions .
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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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