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"Ocean bug has 'smallest genome'
"Pelagibacter has just 1,354 [genes], US biologists report in the journal Science.
What is more, Pelagibacter has none of the genetic clutter that most genomes have accumulated over time.
There are no duplicate gene copies, no viral genes, and no junk DNA."
"Pelagibacter has even gone one step further. It has chosen where possible to use genetic letters - or base pairs - which use less nitrogen in their construction: nitrogen is a difficult nutrient for living things to obtain.
The result is one of the most successful organisms on the planet."