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Plasma cytokine levels in SLE patients. (A), Cytokine levels in plasma from SLE patients and HCs by flow cytometry; (B), The levels of eight cytokines were detected by flow cytometry; (C), The levels of plasma IL-21were detected by ELISA in SLE patients and HCs; (D), Relationship between important indicators in SLE patients. *p < 0 05, **p < 0 01, and ***p < 0 001.
