Leptin gene expression in the utero-placental and uterine compartments during pregnancy. Leptin gene expression during pregnancy in the utero-placental compartments (A), and in the pre-implantation uterus and inter-placental uterine sections (B). RGE: relative gene expression. Bars and whiskers present the geometric mean and the deviation factor. Bars with different superscripts differ at P ≤ 0.043.