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Correlation of serum IgA levels and circulating TFH cells in HCs and HSP patients. (a) and (b) Relationship of serum IgA levels and the percentage of CXCR5+ in CD4+TFH cells in HC and HSP patients, respectively. (c) and (d) Relationship of serum IgA levels and the percentage of ICOS+CXCR5+ in CD4+TFH cells in HCs and HSP patients, respectively. Data shown were the mean ± SD. The horizontal lines show the median.
