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coevolution by physical interaction between RNA sequences

There are several items that relate to the concerted evolution between pairs of sencuencias (especially structural) rRNA as a consequence of physical interaction in tertiary, or even quaternary ...
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detection of primary origin (natural selection or genetic drift) on alterations in sequences

I recently had a question about how to distinguish the origin of variations in the sequences of rRNA as to whether alterations are generated by genetic drift or natural selection. For me it has not ...