Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A wide variety of non-coding RNAs have been identified in various species of organisms known to science. However, RNAs have also been identified in "metagenomics" sequences derived from samples of DNA or RNA extracted from the environment, which contain unknown species. Initial work in this area detected homologs of known bacterial RNAs in such metagenome samples. Many of these RNA sequences were distinct from sequences within cultivated bacteria, and provide the potential for additional information on the RNA classes to which they belong. The distinct environmental sequences were exploited to detect previously unknown RNAs in the marine bacterium Pelagibacter ubique. P. ubique is extremely common in marine sequences. So sequences of DNA extracted from oceans, many of which are inevitably derived from species related to P. ubique, were exploited to facillitate the analysis of possible secondary structures of RNAs predicted in this species.

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