Illustration of a viriod. Viroids are the smallest infectious pathogens known. They are solely composed of a short strand of circular, single-stranded RNA without protein coat. All known viroids are inhabitants of higher plants, in which most cause diseases, some of which are of slight to catastrophic economic importance.
Viroid, Illustration
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Photo credit: © Science History Images / Alamy / Afripics
License: Licensed
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