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ICs in the early human fetal kidney. ICs (arrowheads) in the 10-week gestation fetal kidney are restricted to the medullary ureteric bud (outline in A, magnified in B) and are not seen in the cortical ureteric ducts or in the ureteric tips of the nephrogenic zone (arrows). In the 18-week gestation fetal kidney, ICs are present in the medullary CD (C) and are seen rarely in the cortical CD (D). Stains: red, vATPase; green, RhCG; blue, DAPI. Scale Bars: A, 200 μm, B–D, 25 μm.
