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September 1, 2001; 114(17)

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Cover: The image shows X-gal staining, indicative of Cre-recombinase-mediated recombination, in a secondary transplant of AdCre1-infected mammary epithelial cells, analyzed seven weeks post-transplantation at day 12.5 of pregnancy. See article by M. Rijnkels and J. M. Rosen (pp. 3147-3153).