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https://en.wikipedia.org/wiki/gene

…idae are more than 40 to 50 million years old" . Journal of Virology . 84 (23): 12458– 62. doi : 10.1128/JVI.01789-10 . PMC 2976387 . PMID 20861255 . ^ Flores R, Di Serio F, Hernández C (February 1997). "Viroids: The Noncoding Genomes". Seminars in Virology . 8 (1): 65– 73. doi :…