CD14 and rheumatoid arthritis: To investigate whether CD45RO+ Treg cells from RA patients would show increased cytokine expression following in vitro culture with CD14+ monocytes, CD45RO+ Treg cells were sorted from the PB of RA patients (n = 13) and healthy controls (n = 10) and cultured in vitro with autologous CD14+ monocytes (at a 1:1 ratio) in the presence of anti‐CD3 mAb.