Measuring the levels of IL-17A and IL-17F produced by the whole IL-17-producing CD4+ T cell clones obtained from normal pregnancy (54 T cell clones) and by the whole IL-17-producing CD4+ T cell clones obtained from unexplained recurrent abortion (103 T cell clones), we did not find a significant increase in IL-17A and IL-17F production by CD4+ T cell clones generated from the decidua from unexplained recurrent abortion compared to the IL-17A and IL-17F production by CD4+ T cell clones generated from the decidua of successful pregnancy (Fig. 3b). This evidence concerns the gene CD4 and abortion.