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Viruses (ウイルス, uirusu) have genes composed of DNA as well as many other things, but they have no cellular structure and cannot self-replicate, so they use the cells of living organisms to propagate.
For this reason, they are said to be both living and nonliving.
Biology Biochemistry Pathology Infectious Disease Infection Disease
ウイルスとは [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)
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