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Example sentences for: rdnas

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For example, a series of landmark papers in the late 1980's and early 1990's showed that microbial diversity could be analyzed by sequencing 16S rDNAs from environmental samples (reviewed by [ 1 ] ). Giovannoni used this approach to show that there is a cosmopolitan marine bacterium, designated SAR11, using 44 16S rDNA sequences [ 2 ] . Today, it would be reasonable to perform the same study with thousands of 16S rDNA sequences.
The FastGroup 8 contain sequences that differ from FastGroup 1 by a one bp gap, which explains the reason that ClustalX placed these sequences in Clade 1. Because this gap occurred in all four FastGroup 8 sequences, and not in any of the FastGroup 1 sequences, these two groups probably represent different 16S rDNAs and possibly two bacterial species.
For bacterial 16S rDNAs (Figure 2) sequenced using Bact27F, the Bact517 conserved site is ideal because: 1) the Bact517 site is highly conserved and should be easy to find in most bacterial 16S rDNA sequences 2) the site is ~500 bp away from the sequencing primer, therefore sequence 5' of this site should be good quality, and 3) the Bact517 site is just 3' of the V3 region.