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Example sentences for: rdnas

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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.
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.