Notably, most cells in the expanded CD34–THY1+ population in RA also were positive for surface protein levels of CDH11 (median 84%), and CDH11 was also expressed on the other fibroblast subsets including CD34–THY1– (median 64%) and CD34+ (median 94%) cells (Fig. 3d). This evidence concerns the gene THY1 and rheumatoid arthritis.