IL17F and preeclampsia: Furthermore, in the group of patients with gestational hypertension, a significantly increased percentage of Th17 cells co-expressing IL-17F and IL-22 was observed (median: 2.7% vs. 0.7%; p < 0.0001), as well as a Th17 subpopulation with intracellular expression of IL-21 and IL-22 (median: 1.7% vs. 0.8%; p = 0.0001).