KLRB1 and rheumatoid arthritis: Interestingly, supporting this finding, the proportion of CD161+ Vδ1+ γδ T cells in PBMCs from the HCs, RA patients, and PM/DM was significantly lower than in SSc patients and similar results were found with regard to the absolute number of CD161+ Vδ1+ γδ T cells in PBMCs.