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). Here, IL22 is linked to abortion.