An episodic change of rDNA nucleotide substitution rate has occurred during the emergence of the insect order Diptera.

Abstract excerpt

We have studied the potential reasons for a conspicuous deviation of substitution rates in Dipteran ribosomal genes. Systematic pairwise relative-rate tests reveal that a significant increase in substitution rate is characteristic for Diptera, but not for the other insects analyzed. Estimation of sequence change in specific lineages reveals that most of these substitutions took place during the evolution of the...

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