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Substrate requirements of the arterivirus endoribonuclease. Activity assays containing recombinant protein and 2 μM of 5′-32P-labeled ssRNA2 (A), dsRNA2 (B), or ss/dsDNA (C) were incubated at 30°C, and aliquots were taken at the time points indicated above the lanes. For size markers, see the legend to Fig. 2.
