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Optical Projection Tomography: Fetal ontogeny of human clitoris from 8 to 19 weeks of fetal age. Note the opening zipper, which facilitates vestibular plate opening to form vestibular groove, and lack of closing zipper (seen in the male) with the vestibular groove remaining open. Epithelial tag (green arrows), vestibular plate (red arrows) opening zipper (blue arrows) and vestibular groove (orange arrows).
