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"In other words, natural selection promoted the virus' evolution because the mutations helped them use both their old and new attacks," Meyer explained.??"The finding raises questions of whether the five bird flu mutations may also have multiple functions, and could they evolve naturally?"

Yep, we now have even viruses parasiting on other viruses.
Mimivirus, Mamavirus, Sputnik !
It reads like an expressionist poem. But it's real.
http://en.wikipedia.org/wiki/Sputnik_virophage
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