Studies have found elevated interferon gamma (IFN-γ) and interleukin-2 (IL-2) levels and decreased transforming growth factor beta (TGF-β) levels, an important endogenous anti-inflammatory mediator, (7) in the plasma of women with unexplained infertility compared with fertile controls during the implantation window (luteal phase) (8). Here, TGFB1 is linked to Infertility.