ALB and rheumatoid arthritis: At the same time, we observed that RA subjects are underrepresented in the C1, C2, and C3 clusters indicating that RA-positive HSA is less accessible compared to that of non-RA subjects, but LPR only appears to be underrepresented in within the C3 cluster, indicating that it is at those sites in particular that the RA-specific decrease in HSA accessibility is associated with the characteristic HDC shift.