CCR9/CXCR5 Co-Expressing CD4 T Cells Are Increased in Primary Sjögren's Syndrome and Are Enriched in PD-1/ICOS-Expressing Effector T Cells.

Within the PD-1 hi populations, cells expressing either CXCR5 and/or CCR9 of pSS patients showed a trend of higher ICOS expression compared to HC but this was only significant in CCR9+ Tfh-like cells (28.6% and 55%, medians for HC and pSS, respectively, p = 0.02, Figure 2 B).

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