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Residual activities of DNase I and exonuclease I after incubation for 0–30 min at 60°C. Hydrolysis by DNase I in the absence (open circles) or presence (closed circles) of 20% (w/v) PEG 4000 was carried out for 10 min at 25°C. Hydrolysis by exonuclease I in the absence (open triangles) or presence (closed triangles) of 20% (w/v) PEG 8000 was carried out for 10 min at 37°C.
