CD4 and rheumatoid arthritis: We observed a significantly lower expression of CD45RA compared with the HC, RA, and SSc groups in the following cell types: CD4+/CD57+ T cells (Supplementary Figure 5), CD8adim/CD47dim T cells (Supplementary Figure 6), CD56dim/CD98dim cells (Supplementary Figure 9), and B cells (Supplementary Figure 10).