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POTD/2011-05-19
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Source: Wikipedia, the free encyclopedia.
<
Template:POTD
Picture of the day archives
:
2011 May
<
2011 May 18
2011 May 20
>
Picture of the day
An illustration explaining how
viral shift that confers a
phenotypic
change, and should not be confused with
antigenic drift
, which is the natural
mutation
over time of known viral strains.
Archive
–
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