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Figure 3


Fig. 3. Hh transcriptional targets are not expressed in embryonic mammary buds. Whole-mount X-gal staining of Gli1-lacZ in E14.5 (A,B) and Ptch-lacZ in E13.5 (C,D) embryos. Hair follicles show staining in these embryos but mammary buds (1-4, arrows) are unstained. B,D are higher magnification images of A,C.