KLRC1 and rheumatoid arthritis: Pregnant RA patients only displayed a longitudinal change of NKG2A-positive Vδ1 T cells, with an approximately 2.4-fold higher proportion at the second trimester than at the postpartum time-point (median percentage of NKG2A-positive cells: second trimester, 7.53; postpartum, 3.04; P = 0.02; data not shown).