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. 2015 Sep 11;5:13951. doi: 10.1038/srep13951

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(A) Uterine horns containing the embryos were isolated from pregnant rats and the embryos were collected; Size comparison of embryos from different stages and from a newborn pup. Embryos were dissected under microscope and the kidneys were isolated; size comparison of the kidneys from different developmental stages. (B) HE staining of embryonic sections from different investigated stages, showing the metanephros including the outgrowth of the ureteric bud (ub), the nephric duct (nd), and the early formation of the metanephric mesenchyme (mm), comma-shaped (cs), s-shaped body (ss), cap mesenchyme (cm), glomerulus (g) and tubules (t).