viroides 2
Primera observación de un viroide al microscopio electrónico en el artículo: Sänger, Heinz Ludwig et al. “Viroids are single-stranded covalently closed circular RNA molecules existing as highly base-paired rod-like structures.” Proceedings of the National Academy of Sciences of the United States of America 73 11 (1976): 3852-6.
Sänger et al.