Moreover, we measured the levels of IL-17 produced by Th17/Th2 T cell clones in normal pregnancy (18 % of T cell clones) and unexplained recurrent abortion (4.5 % of T cell clones), and we found that the levels of IL-17A produced by Th17/Th2 cells in successful pregnancy is higher (9507 ± 7000 pg/ml) compared to the levels of IL-17A produced by Th17/Th2 cells in unexplained recurrent abortion (137 ± 80 pg/ml) (p = 0.0001). The gene discussed is IL17A; the disease is abortion.