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Correlation between CD200 and complement 3. (A) In systemic lupus erythematosus (SLE) patients, the proportion of CD3+CD200+ cells was negatively correlated with the serum complement 3 (C3) level (r = -0.486, P < 0.05). (B) Serum CD200 level was negatively correlated with serum C3 in SLE patients (r = -0.45, P = 0.014).
