TNFRSF18 and periodontitis: exFoxp3T cells in periodontitis-induced mice expressed regulatory T (Treg) cell signature molecules such as GITR, KLRG1, FR4, and Nrp1 to a similar extent to GFP+YFP+ T cells while GFP–YFP– T cells expressed these genes at a lower level (Supplementary Fig. 7c).