Sharing DNA with our tiny enemies
source: http://www.neatorama.com/2010/01/09/8-of-human-dna-comes-from-a-40-million-year-old-virus/
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- s_peak
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Viruses and bacteria are probably responsible for many portions of our DNA. We've been co-evolving with them for millions of years... so why not? In many cases it's not beneficial for a virus to kill us. Some of them need us to survive... So why don't some of them just hide in us for generations? Simply put... you are a genetic library that is MUCH more complex than we fully understand. More at the link!
