Effect of diet on the breast tissues morphology. The details of animals and tumor induction are given in the legend of Figure 2. Breast tissues were isolated from the abdominal region on day 15 after the first appearance of the tumor. Breast tissues from non-tumor-bearing (NTB) mice with a similar age group were used for comparison. The whole breast mounting was performed as described in the experimental section. The tissues were observed under a dissecting microscope (Leica S8APO) at 20× magnification and the hyper-proliferative regions (arrows) in the entire breast tissue were recorded.