PTPRC and systemic lupus erythematosus: Distinguishing from JIA and cHC, we identified three additional T cell subtypes—CD4 TEM (CD4+ Effector Memory T cells), MAIT (Mucosal-associated invariant T cells), and PTPRC+ T (PTPRC+ T cells)—in pSS, SLE, and aHC (Figure 4A, Supplementary Figure S6B).