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Immunohistochemical localization of EDNRA and EDNRB in the ampulla and isthmus of the mouse oviduct. Immature mice were treated with 5 IU PMSG to induce follicular development and with 5 IU hCG 48 h later to synchronize ovulation. Tissues were collected at hCG +18 h, fixed in Bouin's fixative, and embedded in paraffin. A higher magnification of the boxed section is presented for each receptor subtype and section of the oviduct.
