A) BrdU immunohistochemistry was carried out on mammary glands derived from mice that were treated with the dimerizer for a 2-week period. Shown is the % BrdU positive cells per TEB field. (*p<0.05, n=4/per group, Scale bar 20mm). B) TUNEL immunohistochemistry of mice dimerized for 4 weeks. Shown is quantification of the TUNEL immunohistochemistry per TEB field (*p<0.05, n=4/per group, Scale bar 20mm). C) Mice were dimerized for 4 weeks and immunohistochemical analysis of TEBs was conducted using the luminal epithelial marker cytokeratin 8 (n=5/per group, Scale bar 50mm).