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Transplantation of epithelium. Whole-mount preparations of mammary glands from PR+/+.RAG1−/− recipients. (Left) Preparation derived from a recipient after parturition. (Right) Preparation derived from a virgin mouse. (Top) Transplanted PR−/− epithelium. (Middle) Transplanted PR+/+ epithelium. (Bottom) Endogenous mammary gland.
