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HDV and plant viruses

Bruce Phillips bap at MED.PITT.EDU
Thu Jan 19 22:09:21 EST 1995

	While clearly HDV is not a plant virus, regardless of some
similarity to a tomato virus??, it is interesting to note that it is 
the closest thing to the animal equivalent of a viroid- a class of
organisms to date only found in plants.  However, strictly speaking,
HDV is not a true viroid, despite it similar replicative mechanisms,
because a portion of the HDV RNA encodes a protein- whereas viroids
encode no proteins at all.

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