This manuscript is an outgrowth of my discovery of the viroids in 1971, which has been endorsed by the International Committee for the Taxonomy of Viruses (ICTV) as a new order called Subviral Agents, which now consists of two families and upward of 40 species, all isolated from higher plants. Most of these cause diseases of various crops. fruit trees, or ornamental plants. Here I ask the question why, so far, these plant viroids are not complemented by their counterparts in animals.
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