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Serum DNase activity in three groups of patients. Mean ± SD DNase activities are shown. The 113 SLE patients had significantly decreased DNase activity (63.75% ± 12.1%) compared with that for the 14 controls (81.3% ± 9.25%) (P < 0.001). The sera of the nine UCTD patients also presented decreased DNase activity (64.9% ± 18.2%), similar to the values for the SLE patients but not significantly different from those for the controls (P = 0.0295).
