Mengo virus
Mengo virus is an icosahedral RNA-containing virus, 27 nm in diameter, causing rodents neuropathy. Viral particles agregate during adsorption on mica, they form islands of dense monolayer. Usually the viruses form hexagonal monolayer, but as you can see on this image a particle can be fixed standing on the vertex between five other virions.
© Protopopova Anna. Physical department of MSU, Russia
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