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Sagittal sections of a 12-week human female fetal reproductive tract immunostained with PAX2 (A–B) and FOXA1 (C–D). PAX2-reactive epithelial cells extend to near the junction with the introitus/urethra (A–B). FOXA1-reactive epithelial cells extend only a short distance into the solid vaginal plate (C–D). Scale bar in A also refers to D. Scale bar in D also refers to C.
