LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Satellite tobacco necrosis virus. Computer illustration showing the surface structure of a tobacco necrosis satellivirus particle (virion). Satellite viruses are subviral agents consisting of a nucleic acid core surrounded by a protein coat (shown here). They cannot infect host cells without a helper virus, which in this case is the tobacco necrosis virus.
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