RRAD and rheumatoid arthritis: While we did not observe a significant difference in PLP1 expression by LNSCs from different donor groups, we interestingly found that GAD1 and RRAD has a variable expression pattern in LNSCs (all passage 2) derived from healthy individuals, RA-risk individuals and RA patients (healthy individuals n = 14, RA-risk individuals n = 23, and RA patients n = 24).