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Enzymatic Activities of NSP2. (A) Nucleoside triphosphatase (NTPase) and RNA-triphosphatase (RTPase) activities of NSP2 are cartoon. In this case, the terminal γ phosphate of either a cellular NTP or a viral RNA is removed by NSP2, yielding inorganic phosphate and NDP. (B) Nucleoside diphosphate kinase (NDPase) activity of NSP2 is cartooned, whereby the terminal γ phosphate is added to a cellular NDP to form an NTP.
