IFNG and abortion: The effect of SGS and LKD on the T-helper cell (Th1)/T-helper cell (Th2) balance during pregnancy was examined in abortion-prone mice by measuring the serum levels of interleukin 2 (IL-2), interleukin 4 (IL-4), interleukin 10 (IL-10), transforming growth factor-beta 1 (TGFβ1), and interferon-gamma (IFNγ).