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Scientist removes cell growth medium from a 6–well plate in preparation for a plaque assay, which is a test that allows…
Centers for Disease Control and Prevention (Source)
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Scientist removes cell growth medium from a 6–well plate in preparation for a plaque assay, which is a test that allows scientists to count how many flu virus particles (virions) are in a mixture.

Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

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