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Fig. 4. X-gal staining in secondary transplants of AdCre1-infected mammary epithelium. (A) 2443L, virgin, magnification 20x; (B) 2442L, 12.5 day pregnant, 20x; (F) 2448R, 1 day lactation, 20x; (C) 2448R, 10x, X-gal and carmine whole mount staining. Hematoxylin- and eosin-stained sections of outgrowths are shown in A-C. (D) 2443L, 100x; (G) 400x, 2442L; (E) 100x; (H) 400x; (I) 2448R, 400x.