However, the percentages of Th2 (p = 0.00001) and Th17/Th2 (producing IL-4 plus IL-17A, IL-17F and IL-22) (p = 0.001) T cell clones were significantly higher in the decidua of normal pregnancy compared to decidua of women suffering from unexplained recurrent abortion (Fig. 3a). This evidence concerns the gene IL17F and abortion.