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Immunohistochemistry of SOX9. (A,B) SOX9 was localized in the ooplasm of primary and pre-vitellogenic oocytes (white arrowheads). (C,D) SOX9 was expressed in the theca interna cell layer, which surrounded the mature follicles (white arrowhead, boxed areas). (E,F) Many stem cells (arrowheads, boxed areas) in the ovarian stroma expressed SOX9.
