Figure 1

Whole ovary histo-architecture during different stages of estrus cycle in one month old Swiss mice. Follicles in different stages of development and corpus lutea can be observed. A &B During di-estrus stage, the ovarian surface is covered with cuboidal or flat epithelial cells. C &D During pro-estrus stage, a small area of the surface epithelial crypt reveals the presence of columnar epithelial cells (arrowhead). Bar: A&C-100μm, B&D-20μm.