CD4 and preeclampsia: We found that frequencies of cord blood CD4+Foxp3+Helios+ thymic-derived natural Tregs (nTreg) were also significantly lower in preeclampsia (p = 0.035, unpaired t-test), especially in those who did not receive steroid treatment (p = 0.01, one-way ANOVA with Dunnett’s multiple comparisons test) (Fig. 2d).