Figure 1

Deletion of Sox9 results in mammary gland defects in 3 and 5 weeks old mice. Whole mount analysis of mammary glands from control (MMTV-Cre; Sox9^wt/wt) and Sox9 cKO (MMTV-Cre; Sox9^fl/fl) mice. Mammary glands were harvested at 3, 5, 8 weeks, mid-pregnancy, lactation day 1, and lactation day 10 and stained with carmine alum and analyzed under the microscope.