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Increased frequency of follicular helper T (Tfh) cells in BM from IRP patients. Representative flow cytometry plots of CD4+CXCR5+ Tfh cells. Comparison of CD40L (CD154) and ICOS expressions according to the expression of CXCR5 in each CD4 gate. Representative flow cytometry plots of the expression of IL-21 in CD4+CXCR5+ gate. Percentage of intracytoplasmic CD4+CXCR5+IL-21+ Tfh cells in IRP patients.
