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relationship using only a few specimens. Coding regions of rDNA are highly conserved among species but ITS regions are variable due to insertions, deletions, and point mutations. Between remote species as human and frog comparison of sequences at ITS tracts is not appropriate. Conserved sequences at coding regions of rDNA allow comparisons of remote species, even between yeast and human. Human 5.8S rRNA has 75% identity with yeast 5.8S rRNA.In cases for sibling species, comparison of the rDNA segment including ITS tracts among species and phylogenetic

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