Mimiviruses } James L. Van Etten, American Scientist
Most giant viruses have only been discovered and characterized in the  past few years. There are several reasons why these striking biological  entities remained undetected for so long. Among the most consequential  is that the classic tool for isolating virus particles is filtration  through filters with pores of 200 nanometers. With viruses all but  defined as replicating particles that occur in the filtrate of this  treatment, giant viruses were undetected over generations of virology  research. (Mimivirus disrupted this evasion tactic by being so large it  was visible under a light microscope.)

Mimiviruses } James L. Van Etten, American Scientist

Most giant viruses have only been discovered and characterized in the past few years. There are several reasons why these striking biological entities remained undetected for so long. Among the most consequential is that the classic tool for isolating virus particles is filtration through filters with pores of 200 nanometers. With viruses all but defined as replicating particles that occur in the filtrate of this treatment, giant viruses were undetected over generations of virology research. (Mimivirus disrupted this evasion tactic by being so large it was visible under a light microscope.)

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    i learned about these!! the missing link between living and non-living things (perhaps)
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