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Circulatory Tfh1 and Tfh2 cells in patients with AAV. (a) The gate strategy for circulatory Tfh1 and Tfh2 cells. The percentage and count of circulatory Tfh1 (b, c) and Tfh2 (d, e) cells and Tfh2/Tfh1 ratios (f) in patients with AAV and healthy controls. ∗P < 0.05; ∗∗P < 0.01. Tfh: T follicular helper cells.
