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Early work showed molnupiravir inserts itself into RNA in place of the nucleoside cytidine, prompting errors in the copying process and causing a lethal buildup of mutations in the virus.—Robert F. Service, Science | AAAS, 11 Mar. 2021 Creating this second base editor was harder than the first because an equivalent to the cytidine deaminase used by Dr Liu, which would be needed to pull it off, does not exist in nature.—The Economist, 26 Oct. 2017
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